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I am interested to see how it performs at that length. I want to rebuild mine and make one small like 12x12x3 for most of the stuff I do but then I would like something like your plan for some bigger projects.
I did a rigidity test on some stainless steel at different wall thicknesses, It can handle that length for sure I did the tests at 6′ lengths or 8 can’t remember and hung a 10lb weight. Have a look if you run into issues with conduit SS is the fix. http://www.vicious1.com/forum/topic/stainless-steel-quick-and-dirty-flex-test/