Meh, it can be possible in my opinion if badspot did hidden nodes on a jeep.
It could work the same way as the Avatar Designer.
It could work. Then it could be painted any colour and a lot of shapes.
Mounts would have to stay a constant number (e.g. you can have seats in set positions, but not anywhere else)
I think that the custom wheel thing would work, although a few new wheel models would need to be made for it to be useful. (Otherwise you have the choice of 'Jeep Tire', 'invisible magic skis-like traction' and nothing else)
The only problem might be the vehicle explosion (since you'd have to cope with any number of wheels and any number of nodes un/hidden), but that could just be replaced with an instant one, like the magic carpet does.