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i made this two summers ago, its 16 feet long. i just got four 4' long sections 2x4, angled the edges so when put together they'd form a C, ( i used a 7 1/2 degree angle) then used pieces of 1/4 inch plywood cut to fit the angles to hold them together, then added feet just like on a regular rail and added the cross bean things for extra support, for the PVC i used 2 inch thick and had a friend hold it while i screwed it in place. hope that helps.