My first shelterlogic greenhouse front end is on it's last legs. I already plan to fix up the tears with some 6mil plastic using 3M spray contact cement to put it on. My door is now shot and I need to come up with something to replace it. I was thinking along the lines of making a frame then making a door out of PVC. I can pretty much figure out the door but not sure what would be the best way to build the frame for it. The top of the arch is 8' high on center. The frame and ribs are made of 1.65" steel tubing. The door doesn't have to be 8' high so I was wondering if building a frame of wood would suffice? I'm not sure though what size wood to use. I would probably also have to notch the frame top and bottom so it would rest on the tubing. Anyway, any and all suggestions would be appreciated.