Hawk Engineering built my shell using 1.5" steel sq tubing on 16" centers, .050" aluminum skins bonded with VHB.
Just for safety's sake, I went inside before insulating and reinforced the VHB with Sikaflex 252 by squeezing a bead down each side of every sq tube.
Sikaflex 252 is used in the manufacture of commercial truck bodies. It cures in 24 hours and once set up, is impossible to separate the sq tube from the .050" alum without destroying it.
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