
<PAGE>   1
                                                                EXHIBIT 10(e)(3)

                                   GUARANTY

                                          BRYAN                ,       TX
                                         ---------------------------------------
                                                   (City)             (State)

                                                    MAY 27, 1993
                                               ---------------------------------

  For good and valuable consideration, the receipt and sufficiency of which are
hereby acknowledged, and to induce THE FIRST NATIONAL BANK OF BRYAN, 2807 TEXAS
AVE., P.O. BOX 833, BRYAN, TX 77805 (herein, with its participants, successors
and assigns, called "Lender"), at its option, at any time or from time to time
to make loans or extend other accommodations to or for the account of BODYBILT
SEATING, INC. (herein called "Borrower") or to engage in any other transactions
with Borrower, the Undersigned hereby absolutely and unconditionally guarantees
to Lender the full and prompt payment when due, whether at maturity or earlier
by reason of acceleration or otherwise, of the debts, liabilities and
obligations described as follows:

    A. If this [ ] is checked, the Undersigned guarantees to Lender the payment
       and performance of the debt, liability or obligation of Borrower to
       Lender evidenced by or arising out of the
       following:________________________________ and any extensions, renewals
       or replacements thereof (hereinafter referred to as the "Indebtedness").

    B. If this [xx] is checked, the Undersigned guarantees to Lender the
       payment and performance of each and every debt, liability and
       obligation of every type and description which Borrower may now or at
       any time hereafter owe to Lender (whether such debt, liability or
       obligation now exists or is hereafter created or incurred, and whether
       it is or may be direct or indirect, due or to become due, absolute or
       contingent, primary or secondary, liquidated or unliquidated, or joint,
       several, or joint and several; all such debts, liabilities and
       obligations being hereinafter collectively referred to as the
       "Indebtedness").  Without limitation, this guaranty includes the
       following described debt(s):  PROMISSORY NOTE NUMBER 033-118-61 DATED
       MAY 27, 1993.

  The term "Indebtedness" as used in this guaranty shall not include any
  obligations entered into between Borrower and Lender after the date hereof 
  (including any extensions, renewals or replacements of such obligations) for 
  which Borrower meets the Lender's standard of creditworthiness based on 
  Borrower's own assets and income without the addition of a guaranty, or for 
  which a guaranty is required but Borrower chooses someone other than the 
  joint Undersigned to guaranty the obligation.

  The Undersigned further acknowledges and agrees with Lender that:

  1. No act or thing need occur to establish the liability of the Undersigned
hereunder, and no act or thing, except full payment and discharge of all
indebtedness, shall in any way exonerate the Undersigned or modify, reduce,
limit or release the liability of the Undersigned hereunder.

  2. This is an absolute, unconditional and continuing guaranty of payment of
the Indebtedness and shall continue to be in force and be binding upon the
Undersigned, whether or not all Indebtedness is paid in full, until this
guaranty is revoked by written notice actually received by the Lender, and such
revocation shall not be effective as to Indebtedness existing or committed for
at the time of actual receipt of such notice by the Lender, or as to any
renewals, extensions and refinancings thereof.  If there be more than one
Undersigned, such revocation shall be effective only as to the one so revoking. 
The death or incompetence of the Undersigned shall not revoke this guaranty,
except upon actual receipt of written notice thereof by Lender and then only as
to the decedent or the incompetent and only prospectively, as to future
transactions, as herein set forth.

  3. If the Undersigned shall be dissolved, shall die, or shall be or become
insolvent (however defined) or revoke this guaranty, then the Lender shall have
the right to declare immediately due and payable, and the Undersigned will
forthwith pay to the Lender, the full amount of all Indebtedness, whether due
and payable or unmatured.  If the Undersigned voluntarily commences or there is
commenced involuntarily against the Undersigned a case under the United States
Bankruptcy Code, the full amount of all Indebtedness, whether due and payable or
unmatured, shall be immediately due and payable without demand or notice
thereof.

  4. The liability of the Undersigned hereunder shall be limited to a principal
amount of $32,875.27 (if unlimited or if no amount is stated, the Undersigned
shall be liable for all Indebtedness, without any limitation as to amount),
plus accrued interest thereon and all attorneys' fees, collection costs and
enforcement expenses referable thereto.  Indebtedness may be created and
continued in any amount, whether or not in excess of such principal amount,
without affecting or impairing the liability of the Undersigned hereunder.  The
Lender may apply any sums received by or available to Lender on account of the
Indebtedness from Borrower or any other person (except the Undersigned), from
their properties, out of any collateral security or from any other source to
payment of the excess.  Such application of receipts shall not reduce, affect
or impair the liability of the Undersigned hereunder.  If the liability of the
Undersigned is limited to a stated amount pursuant to this paragraph 4, any
payment made by the Undersigned under this guaranty shall be effective to
reduce or discharge such liability only if accompanied by a written transmittal
document, received by the Lender, advising the Lender that such payment is made
under this guaranty for such purpose.

  5. The Undersigned will pay or reimburse Lender for all costs and expenses
(including reasonable attorneys' fees and legal expenses) incurred by Lender in
connection with the protection, defense or enforcement of this guaranty in any
litigation or bankruptcy or insolvency proceedings.

This guaranty includes the additional provisions on page 2, all of which are
made a part hereof.

  This guaranty is [xx[ unsecured; [ ] secured by a mortgage or security
agreement dated ___________; [ ] secured by ____________________________.

  IN WITNESS WHEREOF, this guaranty has been duly executed by the Undersigned
the day and year first above written.

                                      X
                                      -----------------------------------------
                                        MARK A. MCMILLAN                       
                                      -----------------------------------------
                                      -----------------------------------------
                                      -----------------------------------------
                                      "Undersigned" shall refer to all persons
                                      who sign this guaranty, severally and 
                                      jointly.

BANKERS SYSTEMS, INC., ST. CLOUD, MN 56301 (1-800-397-2341) FORM M-240 5/20/91
(For Corporate Guarantor use M-250)                                (page 1 of 2)

                              


<PAGE>   2
                            ADDITIONAL PROVISIONS


   6.  Whether or not any existing relationship between the Undersigned and
Borrower has been changed or ended and whether or not this guaranty has been
revoked, Lender may, but shall not be obligated to, enter into transactions
resulting in the creation or continuance of Indebtedness, without any consent
or approval by the Undersigned and without any notice to the Undersigned.  The
liability of the Undersigned shall not be affected or impaired by any of the
following acts or things (which Lender is expressly authorized to do, omit or
suffer from time to time, both before and after revocation of this guaranty,
without notice to or approval by the Undersigned): (i) any acceptance of
collateral security, guarantors, accommodation parties or sureties for any or
all Indebtedness; (ii) any one or more extensions or renewals of Indebtedness
(whether or not for longer than the original period) or any modification of the
interest rates, maturities or other contractual terms applicable to any
Indebtedness; (iii) any waiver, adjustment, forbearance, compromise or
indulgence granted to Borrower, any delay or lack of diligence in the
enforcement of Indebtedness, or any failure to institute proceedings, file a
claim, give any required notices or otherwise protect any Indebtedness; (iv)
any full or partial release of, settlement with, or agreement not to sue,
Borrower or any other guarantor or other person liable in respect of any
Indebtedness; (v) any discharge of any evidence of Indebtedness or the
acceptance of any instrument in renewal thereof or substitution therefor; (vi)
any failure to obtain collateral security (including rights of setoff) for
Indebtedness, or to see to the proper or sufficient creation and perfection
thereof, or to establish the priority thereof, or to protect, insure, or
enforce any collateral security; or any release, modification, substitution,
discharge, impairment, deterioration, waste, or loss of any collateral
security; (vii) any foreclosure or enforcement of any collateral security;
(viii) any transfer of any Indebtedness or any evidence thereof; (ix) any order
of application of any payments or credits upon Indebtedness; (x) any election
by the Lender under Section 1111(b)(2) of the United States Bankruptcy Code.

   7.  The Undersigned waives any and all defenses, claims and discharges of
Borrower, or any other obligor, pertaining to Indebtedness, except the defense
of discharge by payment in full.  Without limiting the generality of the
foregoing, the Undersigned will not assert, plead or enforce against Lender any
defense of waiver, release, statute of limitations, res judicata, statute of
frauds, fraud, incapacity, minority, usury, illegality or unenforceability
which may be available to Borrower or any other person liable in respect of any
indebtedness, or any setoff available against Lender to Borrower or any such
other person, whether or not on account of a related transaction.  The
Undersigned expressly agrees that the Undersigned shall be and remain liable,
to the fullest extent permitted by applicable law, for any deficiency remaining
after foreclosure of any mortgage or security interest securing Indebtedness,
whether or not the liability of Borrower or any other obligor for such
deficiency is discharged pursuant to statute or judicial decision.  The
undersigned shall remain obligated, to the fullest extent permitted by law, to
pay such amounts as though the Borrower's obligations had not been discharged.

   8.  The Undersigned further agrees that the undersigned shall be and remain
obligated to pay Indebtedness even though any other person obligated to pay
Indebtedness, including Borrower, has such obligation discharged in bankruptcy
or otherwise discharged by law.  "Indebtedness" shall include post-bankruptcy
petition interest and attorneys' fees and any other amounts which Borrower is
discharged from paying or which do not otherwise accrue to Indebtedness due to
Borrower's discharge, and the Undersigned shall remain obligated to pay such
amounts as though Borrower's obligations had not been discharged.

   9.  If any payment applied by Lender to Indebtedness is thereafter set
aside, recovered, rescinded or required to be returned for any reason
(including, without limitation, the bankruptcy, insolvency or reorganization of
Borrower or any other obligor), the Indebtedness to which such payment was
applied shall for the purposes of this guaranty be deemed to have continued in
existence, notwithstanding such application, and this guaranty shall be
enforceable as to such Indebtedness as fully as if such application had never
been made.

  10.  The Undersigned waives any claim, remedy or other right which the
Undersigned may now have or hereafter acquire against Borrower or any other
person obligated to pay Indebtedness arising out of the creation or performance
of the Undersigned's obligation under this guaranty, including, without
limitation, any right of subrogation, contribution, reimbursement,
indemnification, exoneration, and any right to participate in any claim or
remedy the Undersigned may have against the Borrower, collateral, or other
party obligated for Borrower's debts, whether or not such claim, remedy or
right arises in equity, or under contract, statute or common law.

  11.  The Undersigned waives presentment, demand for payment, notice of
dishonor or nonpayment, and protest of any instrument evidencing Indebtedness. 
Lender shall not be required first to resort for payment of the Indebtedness to
Borrower or other persons or their properties, or first to enforce, realize
upon or exhaust any collateral security for Indebtedness, before enforcing this
guaranty.

  12.  The liability of the Undersigned under this guaranty is in addition to
and shall be cumulative with all other liabilities of the Undersigned to Lender
as guarantor or otherwise, without any limitation as to amount, unless the
instrument or agreement evidencing or creating such other liability
specifically provides to the contrary.

  13.  This guaranty shall be enforceable against each person signing this
guaranty, even if only one person signs and regardless of any failure of other
persons to sign this guaranty.  If there be more than one signer, all
agreements and promises herein shall be construed to be, and are hereby
declared to be, joint and several in each of every particular and shall be
fully binding upon and enforceable against either, any or all the Undersigned. 
This guaranty shall be effective upon delivery to Lender, without further act,
condition or acceptance by Lender, shall be binding upon the Undersigned and
the heirs, representatives, successors and assigns of the Undersigned and shall
inure to the benefit of Lender and its participants, successors and assigns. 
Any invalidity or unenforceability of any provision or application of this
guaranty shall not affect other lawful provisions and application hereof, and
to this end the provisions of this guaranty are declared to be severable. 
Except as authorized by the terms herein, this guaranty may not be waived,
modified, amended, terminated, released or otherwise changed except by a
writing signed by the Undersigned and Lender.  This guaranty shall be governed
by the laws of the State in which it is executed.  The Undersigned waives
notice of Lender's acceptance hereof.


BANKERS SYSTEMS, INC., ST. CLOUD, MN 56301 (1-800-397-2341) FORM M-240 5/20/91
(For Corporate Guarantor use M-250)                                (page 2 of 2)

                              


<PAGE>   3
              EXHIBIT 10(e)(3) - SCHEDULE OF SIMILAR GUARANTIES


      Lender:   . . . . . . . . . .     The First National Bank of Bryan
                                        2807 Texas Avenue
                                        PO Box 833
                                        Bryan, Texas 77805
      Borrower:   . . . . . . . . .     BodyBilt Seating, Inc.
                                        4455 Carter Creek Parkway
                                        Bryan, Texas 77802
 I.   Date:   . . . . . . . . . . .     August 27, 1993
      Loan Type:  . . . . . . . . .     Single Advance (#033-118-62)
      Amount:   . . . . . . . . . .     $20,797.48
      Interest Rate:  . . . . . . .     7.25% per annum on 360-day year
      Purpose:  . . . . . . . . . .     Business; purchase vehicle
      Repayments:   . . . . . . . .     Monthly installments of $415.31 from
                                           September 27, 1993 to August 27, 1998
      Guarantor:  . . . . . . . . .     Mark McMillan
      Security:   . . . . . . . . .     None
      Liability Limit:  . . . . . .     $20,797.48

II.   Date:   . . . . . . . . . . .     December 9, 1993
      Loan Type:  . . . . . . . . .     Single Advance (#033-118-63)
      Amount:   . . . . . . . . . .     $43,278.04
      Interest Rate:  . . . . . . .     6.75% per annum on 360-day year
      Purpose:  . . . . . . . . . .     Business; purchase two vehicles
      Repayments:   . . . . . . . .     Monthly installments of $1,033.25 from
                                           January 1, 1994 to December 9, 1997
      Guarantor:  . . . . . . . . .     Mark McMillan
      Security:   . . . . . . . . .     None
      Liability Limit:  . . . . . .     $43,278.04

III.  Date:   . . . . . . . . . . .     March 25, 1994
      Loan Type:  . . . . . . . . .     Single Advance (#033-118-64)
      Amount:   . . . . . . . . . .     $35,066.99
      Interest Rate:  . . . . . . .     7.5% per annum on 360-day year
      Purpose:  . . . . . . . . . .     Business; purchase two vehicles
      Repayments:   . . . . . . . .     Monthly installments of $1,092.79 from
                                           April 25, 1994 to March 25, 1997
      Guarantor:  . . . . . . . . .     Mark McMillan
      Security:   . . . . . . . . .     None
      Liability Limit:  . . . . . .     None
<PAGE>   4
IV.   Date:   . . . . . . . . . . .     January 17, 1996
      Loan Type:  . . . . . . . . .     Single Advance (#033-118-65)
      Amount:   . . . . . . . . . .     $16,900.00
      Interest Rate:  . . . . . . .     8.625% per annum on 360-day year
      Purpose:  . . . . . . . . . .     Business; purchase vehicle for
                                           salesman's use
      Repayments:   . . . . . . . .     Monthly installments of $348.75 from
                                           February 17, 1996 to January 17, 2001
      Guarantor:  . . . . . . . . .     Mark McMillan
      Security:   . . . . . . . . .     None
      Liability Limit:  . . . . . .     None

 V.   Date:   . . . . . . . . . . .     April 12, 1996
      Loan Type:  . . . . . . . . .     Single Advance (#033-118-66)
      Amount:   . . . . . . . . . .     $19,250.00
      Interest Rate:  . . . . . . .     8.75% per annum on 360-day year
      Purpose:  . . . . . . . . . .     Business; purchase vehicle for
                                           salesman's use
      Repayments:   . . . . . . . .     Monthly installments of $477.92 from
                                        May 12, 1996 to April 12, 2000
      Guarantor:  . . . . . . . . .     Mark McMillan
      Security:   . . . . . . . . .     None
      Liability Limit:  . . . . . .     None

VI.   Date:   . . . . . . . . . . .     May 23, 1996
      Loan Type:  . . . . . . . . .     Single Advance (#033-118-67)
      Amount:   . . . . . . . . . .     $13,775.00
      Interest Rate:  . . . . . . .     8.75% per annum on 360-day year
      Purpose:  . . . . . . . . . .     Business; purchase leased vehicle
      Repayments:   . . . . . . . .     Monthly installments of $437.31 from
                                           June 23, 1996 to May 23, 1999
      Guarantor:  . . . . . . . . .     Mark McMillan
      Security:   . . . . . . . . .     None
      Liability Limit:  . . . . . .     None

VII.  Date:   . . . . . . . . . . .     June 15, 1995
      Loan Type:  . . . . . . . . .     Single Advance (#033-118-69)
      Amount:   . . . . . . . . . .     $29,550.00
      Interest Rate:  . . . . . . .     8.75% per annum on 360-day year
      Purpose:  . . . . . . . . . .     Business; purchase vehicle
      Repayments:   . . . . . . . .     Monthly installments of $733.75 from
                                           July 15, 1995 to June 15, 1999
      Guarantor:  . . . . . . . . .     Mark McMillan
      Security:   . . . . . . . . .     None
      Liability Limit:  . . . . . .     None
<PAGE>   5
VIII. Date:   . . . . . . . . . . .     August 21, 1995
      Loan Type:  . . . . . . . . .     Single Advance (#033-118-71)
      Amount:   . . . . . . . . . .     $21,295.78
      Interest Rate:  . . . . . . .     9.125% per annum on 360-day year
      Purpose:  . . . . . . . . . .     Business; purchase vehicle
      Repayments:   . . . . . . . .     Monthly installments of $532.63 from
                                           September 21, 1995 to August 21, 1999
      Guarantor:  . . . . . . . . .     Mark McMillan
      Security:   . . . . . . . . .     None
      Liability Limit:  . . . . . .     None

IX.   Date:   . . . . . . . . . . .     August 24, 1995
      Loan Type:  . . . . . . . . .     Single Advance (#033-118-72)
      Amount:   . . . . . . . . . .     $19,313.10
      Interest Rate:  . . . . . . .     9.5% per annum on 360-day year
      Purpose:  . . . . . . . . . .     Business; purchase Plymouth Voyager
      Repayments:   . . . . . . . .     Monthly installments of $620.00 from
                                           September 24, 1995 to August 24, 1998
      Guarantor:  . . . . . . . . .     Mark McMillan
      Security:   . . . . . . . . .     None
      Liability Limit:  . . . . . .     None

 X.   Date:   . . . . . . . . . . .     October 26, 1995
      Loan Type:  . . . . . . . . .     Single Advance (#033-118-73)
      Amount:   . . . . . . . . . .     $79,500.00
      Interest Rate:  . . . . . . .     10.0% per annum on 360-day year
      Purpose:  . . . . . . . . . .     Business; Renewal - Purchase Equipment
      Repayments:   . . . . . . . .     Monthly interest installments from
                                           November 26, 1995 to October 26, 2000
                                        Monthly principal installments of
                                           $1,325.00 from November 26, 1995 to 
                                           October 26, 2000
      Guarantor:  . . . . . . . . .     Mark McMillan
      Security:   . . . . . . . . .     None
      Liability Limit:  . . . . . .     Unlimited

XI.   Date:   . . . . . . . . . . .     November 8, 1995
      Loan Type:  . . . . . . . . .     Single Advance (#033-118-74)
      Amount:   . . . . . . . . . .     $17,950.00
      Interest Rate:  . . . . . . .     9.5% per annum on 360-day year
      Purpose:  . . . . . . . . . .     Business; purchase car for salesman's
                                           use
      Repayments:   . . . . . . . .     Monthly installments of $505.20 from
                                           December 8, 1995 to May 8, 1999
      Guarantor:  . . . . . . . . .     Mark McMillan
      Security:   . . . . . . . . .     None
      Liability Limit:  . . . . . .     None
