Howdy MildFury. Welcome to the forum.
A few folks have done the E/motorbike thing. I don't see why it would not work on yours.
Some great builds and ideas; http://www.google.com/cse?cx=partner...power%2Bhybrid
Wow, I just skimmed some of those posts. Seems like it would be a great project.
A thing I have been wondering about for a while was could you put a small generator on the rack and rig it to charge the batts or at least extend your trip. 27 MPH is purty awesome for an ebike and getting 12 miles.
This one is 40 LBS but like the idea; http://www.harborfreight.com/engines...tor-66619.html