Back in the 90's I subscribed to the British classic car mags. I vaguely remember there being a big controversy about a restoration of a famous classic from a few parts. It's been so long I don't remember details. It was either burned up in a fire or recovered from a Swiss lake, and all that remained of the original car was like, a brake rotor, part of the steering wheel and the engine block.
The "restoration" was done from there and represented as the original vehicle.
I think something similar happened with a factory team 250 GTO, too, once they became worth $15 million.