Definitions for mock-up
Random House Webster's College Dictionary
a model, often full-size, for study, testing, or teaching:
a mock-up of an experimental aircraft.
Origin of mock-up:
full-scale working model of something built for study or testing or display
model, mock up(verb)
construct a model of
"model an airplane"
Dictionary of Military and Associated Terms
A model, built to scale, of a machine, apparatus, or weapon, used in studying the construction of, and in testing a new development, or in teaching personnel how to operate the actual machine, apparatus, or weapon.