Volvoman,
I to am building my box with 2" tubing. I built the floor first and then the roof. Floor is 2X4 11ga outside with 2X3 11ga floor joist,roof is 2X3 14 ga outer with 2X2 14ga roof stringers. After the floor was completed I framed and tacked together the roof framework with it clamped to the floor framework.Make sure the floor framework is perfectly level. I then picked up the roof framing with a overhead hoist and tacked in the four corners after temp bracing everything with angle iron and C-clamps.I then installed the remaining wall studs.Surprised me,it was within 1/16th inch square after it was all welded up.Welding heat will really pull them out of square if not properly braced. I would post pictures on here but I have been unsucessfull on three other trys. If you send me your email address I will gladly send you the pic's. The box is currently sitting on the truck for a mock-up to make sure everything will fit as it should.
Michael
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