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I've built the housing for the tubes. Here are the fusion diagrams. I've only really modelled parts which will be machined (my lockdown project was a cheap 3d printed cnc), and the different are just to help see the components better.
In reality, the parts were all cut from the same sheet of 12mm marine ply and the tolerances were out by just enough (<0.5mm) that it required some wood filler and a lot of sanding to fix and I'll be painting everything to hide the visual defects more. Functionally, the finger joints make it really rigid.
I'll post pics of the real thing when the paint is dry.
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