If you are runnning the 3 speed tranny, just use a 20-22T pinion with the 47T plastic spur gear and get a heatsink and fans for both the Quark and Feigao motors and you should be good to go.
The U section of CF would probably need to be be custom. The guy at
www.graphiteelegance.com could make it if he ever comes back form vacation. Other than that there should be other places that can make, but it would probably cost more. Just do a web search.