TC, it will be suported by 2' x 4' all around the 2x4s will be on hingins for easy storge. the tracks will be be disconected and stored against the wall when i am not useing it. The layout has to make a U around the first layout (4' x 8'). the U shape can be 5' on the ends of the U shape and on the sides it can be 8' and on the top it can be 2' wide. is that all the specifics you need.