Flex is not something I'd want on a bolt mounting location. Thats what allows a lateral shear load that could snap a bolt or increase the stress on the threads to the point of failure. I would have it rigid. Maybe its compressed enough it won't matter but when the whole point of the cage is safety I wouldn't compromise there.
The clamps would be far easier to align if they weren't fully welded in until after mock-up but I guess that ship has sailed.
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