Not what effing the hell outta the subject, its a valid question. The only difference is its an aftermarket manufactured body shell with a certificate of origin VS a used body shell.
Ditto with a motorcycle. You take a wrecked harley davidson with a good title and use its engine which has a vin that matches the title and put it into an aftermarket frame made by any number of frame manufacturers, is that deceitful? I dunno, but plenty of people do it all the time, all it takes is a DMV safety check to get it registered when built.