@futurebird I wish the whole concept of kit cars had taken off here in the United States. Given the high price of cars today it might if we can get the size of cars down to a reasonable one again.
Also kit planes are a thing. Build a plane that you can then fly at a fraction of the cost of buying a standard plane! You can't fly them commercially, though. There's a whole magazine dedicated to them: https://www.kitplanes.com/