outboard clamp plates usually have hemispherical dimples that help keep the clamps from moving around...
just an FYI..

if you want to minimize the amont of square tube you need...
you could do an aframe in the middle (clamping area) inside a larger perimeter box and cover it with a plate/skin..

think an inverted trapazoidal anarchy symbol with a skin over it..

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Last edited by OldmanoftheSea; 05/11/21.
-OMotS


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