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@gbj_tester
If you can draw it, a machinist can make it. Should be pretty simple, you just have to decide how to retain the bearings and how to fix it to the dropouts. I can think of several different solutions, the trick is refining it to get the Dymaxion
Don't use Ti for this one, it will be hugely expensive and heavier than aluminium. I only used Ti because I was already constrained to using 10mm axles, but anything over about 15mm can be done in aluminium alloy with plenty of strength. 7075T6 alloy bar is about 1/10 the price of 6Al4V Ti of the same dimensions.