Step Three

Lay the bottom frame with the "T" junctions pointing up and insert the 60-inch pieces.  At this point you can use some PVC glue to make these connections permanent , but I found that just sliding them in holds very well. I also had to consider human error before making anything permanent.

Have someone help you hold the 60-inch pieces while you take the top frame and slide it on accordingly. Here is where you will see if you put all the frame pieces in the right order. Don't force any of the pieces together. Try twisting and pulling/pushing on the PVC to get everything to slide together.