WordNet (r) 3.0 (2006):

mock up
    v 1: construct a model of; "model an airplane" [syn: model,
         mock up]

Moby Thesaurus II by Grady Ward, 1.0:

20 Moby Thesaurus words for "mock up":
   burlesque, clay model, copy, dummy, duplication, facsimile,
   imitation, knockoff, lay figure, mannequin, model, paraphrase,
   parody, pilot model, replica, representation, reproduction,
   travesty, version, wood model