How about just make the car white transparent.
That reminded me, you could just use an existing vehicle, like the jeep, and do %jeep.hideNode("ALL"); and it will be invisible
Don't know if it affects the wheels or not, I can't test it because for some reason all my wheeled vehicles are spawning without wheels.
Maybe the light key could be packaged to toggle between hiding/unhiding the nodes to toggle invisibility.
