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Great work John.
With regard to carbon fibre joints I have a suggestion. I used this method for aluminium tube. Get dowel to fit inside your choice of tube. Slit the dowel to accept a piece of flat bar to protrude from the end (aluminium or steel). I presume you aligned the rings of your truss tube with a laser - once the tube mounting holes are in the rings the truss tubes can be made and glued up in exactly the right place. Glue the bar into the dowel and into the tube with epoxy glue.
Cheers
GlennB
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