I finally got around to casting my 38(t) wheels for the build. I wanted to use the Tiger I rubber (same diameter) instead of the kit plastic as well as beef up both the wheel and the control arm and get some brass in there as bushings instead of the plastic on plastic.

The left is the kit wheel and arm, the others are my rendition with the rubber in place. The black one on the right is an extremely strong resin, ABS like in specs, but a pain in the arse to cast.