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I assumed a larger tube diameter ... what diameter do Soma use?
Similar arrangement but at a smaller size shown in the photo - 10mm tube, 6mm inserts, threaded M4, to hold a bag in place which limits the size of the payload. The bag is held on with straps on the outside of the rack using M4 machine screws with washers to spread the load - sufficient to hold things in position but probably too small to carry major loads.
I'd be worried about a overloading significantly larger rack using 10mm mild steel?
Thanks. This is massively helpful. I very much prefer option B as I can do that without recourse to tools I don't have. I also have slight (but scientifically unfounded) reservations about drilling an 8mm hole across a 10mm tube!