Actually it doesn't have a single thing to do with copyright as it isn't a creative work, it's solely under a patent. As long as he doesn't go around calling it a "Lamborghini Countach" he isn't breaking any trademark laws.
Finally a patent only extends to cover something that is in itself patentable. Nintendo is taking forever to get patents on it's DS game cartridges because they're based off of an SD card. If its not found to be useful or inventive then it's not patentable.
Inherently most vehicles are non-patentable as they all serve an identical purpose and relatively few are at all inventive.
Quite simply a patent can be invalidated by someone simply inventing it themselves, which turns something from 'original' to 'obvious' and thus non-patentable.
Vehicle patents are very complicated to enforce, namely because if anyone ever tries to enforce one they can actually end up getting it invalidated (which in patent law, abolition happens more than enforcement). Lamborghini might not be able to enforce a single patent because a court might find it an obvious improvement over Henry Ford's original patent or is outright patent infringement of Fords. It's a serious lose-lose business.