While on the topic of rebodying, I thought I'd bring up this example:
This is a Canadian car, 1 of N (where N tends toward 0) Pontiac 2+2s with a 427/390 and M21.
The car is a total basket case; even the firewall is cracked. Being built in Canada, though, its fully documented by GM Canada.
I have a 427/390 M21 2+2 clone about to be built at Musclecar Restorations in Wisconsin. Its on my own Laurentian that was first car 20 years ago, and that my Dad bought new in '69.
Now, for my purposes, I'm doing it because the car is special to me and me only, and I'm not trying to impress anyone with it or pass it off as real. But if someone else was dumping 100K into a car, it would be very tempting to tag the trim tag, VIN, and other items from this total basket case as the basis of such a restoration.
I think -that- would be the kind of thing everyone agrees on as "bad": transferring only the identity of a basket case to a donor vehicle.
Where the line between that and rebuilding a basket case by transferring parts for B to A rather than from A to B is a discussion I'll leave open to you guys!