I'm trying to make scale models of real cars with working parts. I'm not making parts for real cars. In 1960s, there was Visible Auto Chassis with working transmission, working steering gear, one working brake drum, working suspension, etc BUT it was based on 1950s cars. One time, the Visible V8 Engine had electric "starting" motor and lights for spark plugs. Now, you have to turn the crank to make it run. There are newer engine kits such as ones for Ford Mustang and Hemi V8. On Thingiverse, EricThePoolGuy made working engines and working transmission for Toyota pickup truck. I really want to keep myself busy by making cars with working parts due to the virus that may kill us all.