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@Linc
So the conclusion is that I'm quite happy with the robustness of the tubes compared with an off the shelf alu tube and the actual frame is thicker than my test sample (I got chicken) so will be stronger.
To put the test numbers into perspective, the wooden tube failed at around 110kg with a point load of around 1sqcm. I tried jumping on it (80kg) with my heel and hurt my heel but not the tube.
QED