This was the second thing I ever built. I built it with my friend Scott Kildall at cellspace. Its completely disassemblable, coming apart into 8' lengths and a whole bunch of joints. Its an octogon and I've forgotten the pitch of the roof (either 40 or 50 degrees). The main legs are 1" tubing, with the joints being 1 1/4" tubing. They are secured with locknuts. Pictures of the assembly:

One, two, three, and four.