I have been waiting for Scootworks since January for availability of their belt drive for the America/Speedy. The last correspondence I had with them had an America on test and that was March 29. Haven't heard anything from them since and have decided to leave the chain on for this year (waited too long). There is a big difference in price between Scootworks and QPD ($300 bucks).
Jeff, post some pics of your setup if you get a chance.