No the rod is just Nylon, most big hardwares sell Nylon bolts .
The Hub is actually some kind of dense polypropylene..I said Delrin because I could spell it easier, but in hindsite wasn't a good idea
I think Cut to Size plastics in Chatswood can sell an offcut of suitable plastics , but I don't see any reason why the hexaganol hub couldn't justt be lamination of 2X 12mm ply ?