Just cut the PVC and the 2x4 or whatever it's on at a 45 or so degree angle from the ends of the rail in, that way they can be set up in flat down style without any gaps of any kind. Then set the support legs in about 10 inches from the ends of the rails which will allow the ends to be right next to each other without the feet hitting, also reducing any gaps. This is also important for not hitting the rails during spins out.