I was thinking of the foam and bamboo panels, but on closer reading, it sounds more like an assembly. Still, you are specifying a lot of cutting edge stuff, and that tends to take a lot of time to buy and learn to use well. Those wheels have had a lot of development poured into them, but still have major issues that have kept them off the market. I love bamboo, too, but it is not easy to work with. You might want to read "Structures" or one of J.E. Gordon's other books to help save weight by canny design and appropriate use of materials.
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