You all may laugh at me, but those dont look too hard to fabricate. I know a guy with a plasma cutter table. All you need is a good spoke rim, cut out a circle to match the rim, get a hub that you can jury rig onto the circle plate, and jury rig the spoke holes from the rim into the cricle. I mean jury rigging in the most professional way possible. Now I'm curious if I could make it work or not...