Ron,
Thanks for the request. After I retired (and Zipcycle had closed), I still built a few bikes for friends, an and one requested that I help him add power to his "John Deere" bicycle. It was so much fun that I had to build one for myself. This should be in photo #1. I have since added a miniature square bale of hay on the luggage rack. The second one is for parades (where I don't have to balance it) is a sidecar version that I am still working on adding a body to the sidecar frame. This should be in photo #2. The 3rd photo should be a close-up of the original drive system with the covers removed.
Still having fun in my 70s.
Tom Bartlett