YES! I have done it. Me and some friends put together a summer rail. I just want to share what i have discovered from the experience. First, Its fucking easy. What we did is we had a hill so we went and bought two long pieces of wood about 2'x4' and nailed some carpet into them. Then we had a piece for the ramp onto the rail which was 2'x3' or somesuch mounted on two legs. The legs gave way so i want to say that you should make sure that your legs are damn secure haha. Anyways,we set it up on the hill and spread some dish soap on the carpet. Then we poured water down it and scratched it with our hands to get it to mix and get lubricated. We found that using astroturf wouldve been alot better cuz we needed a shitload of water with carpet and we had no hose nearby so we needed to go to random houses and ask for water in our buckets. We are gonna go buy the astroturf and stick it on the next ttime we do it and we think itll take a lot less water. Anyways, you people who are doubting yourself should do it, cuz damn, its worth it.