My only plan for current cars is keeping the manual transmission from going extinct. I have my own plans to build a street-legal(ish) Quad with a stretched frame to house a litrebike engine. Keep all the gearing the same, except I need to beef up some of the internals along with changing the final drive ratio to better suit a quad versus a street bike. Street wheels and rubber all the way around. I'd like to have it AWD, but that may be too complex for me ATM. Sad thing is that building your own car and getting it certified for road use is a PITA. technichally quads aren't legal to ride on pavement around here, and since it's not a trike or a motorcycle per-se, you'd need to get it classified as a car to make it street legal. That's the PITA part.