I've been wanting to build an open downhill track so I've been testing different materials. I think I found it almost by mistake. I was cleaning the basement and found an old folding vinyl closet door. I saw a track. I cut off a couple slats and mounted them to a styrofoam ramp I've been messing around with. Man this stuff is fast. I'm gonna continue with seaming it together and adding some sides and a starting gate but I think I found my new track material!