if you want a cool portable course, why not either build a mock slotcar track out of 1/4 luan or, take some foam board, carve out some different terrain and coat it with epoxy (not fiberglass it will eat it). You could throw some sand in the resin while its wet for traction/realism. I have been avoiding buying 1 because you know as soon as I do Ill build something like that and I dont have the room.