Does it need good driving mechanics or just motorbikes? CDDA you can build any vehicle you like, you could even make a solar powered amphibious folding ebike - just be careful not to overload the weight on it with some of the larger batteries, easier on large vehicles as you have greater displacement. Though you could make your motorbike 10m long. Width is limited as wider I think will require more than 2 wheels so not really a bike anymore.

The vehicle building system allows building what is commonly called death mobiles.