Well I guess that answers my first question. Now let me show you how ignorant I am ( I don't compete yet) by asking another. What would prevent the judge from asking how accurate is the model ? For instance it was common knowledge, a few years ago, that many of the old Aurora kits were not very accurate.
Aside from these questions, You would take a 1/72 scale model and blow it up to produce a working model involving not only reproducing the outline and scale details, but designing it so that the CG is correct, thrust lines, angle of incidence etc? My hat is off to you sir. I found out many years ago that scratch builing is only a matter of having confidence in your own abilities. It appears some of us have bigger ones than others