[Woodz428]

I think a quick check of e-bay and some other car sales sites would give a speedy enlightenment of which cars languish unbuilt for years. Some are because of time constraints of the owners, but when one manufacturer is regularly up for sale unfinished, I think that says it all.
I'm afraid that while the intent is noble, it would begin a non stop defense by those owners that are trying to make the best of the crap they got. That, of course, won't shorten or help the build time.