Crazy is the word
Looks interesting. I'm wondering however about the steering : You're relying on two joints to make each wheel rotate left or right, but the angle (see detail) looks too steep to me. Did you try it physically ?
In any case, if the shock absorber is compressed, the joint close to the wheel (or even touching it :-/) will clearly block at a square angle...
I like also the idea of allowing front/rear wheels to turn the same way or opposite ways with separate controls.