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Your list of "what if's" are the sort which require "finite element analysis" and, now that I'm retired, I don't have access to the software with that capability. I modeled with sharp corners, which certainly would be avoided. But, I believe I can safely say that, after the FEA and after every effort is made to remove stress concentrations, a structural engineer would still go with the fully boxed configuration. But, again, if you're looking for space to neatly tuck away fuel lines, for instance, the triangulation would be quite adequate.
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