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Ndeipi
Those are some terrific ideas- thank you very much. Never heard of carbon tow, but it looks ideal.
As for tube width, I'm tempted to start with 2mm rod, if only for the excitement. Doesn't matter if the prototype breaks. And imagine a rack made of bits which are so thin that you can hardly see them!
I'm already mentally committed to triangles. Barnes Wallis is my inspiration. Getting compression will be a challenge. I'm no good at conceiving a design in my head. Didn't even pass Physics O level. So it'll be trial and error. I thought I might start by making something out of dowel.