I promised pics, so here goes. The fab job on the bearing mounts is pretty crude but that is what you get with a jig saw. The production units will be much nicer. I am interested in feedback. Like I said I would like to make this a kit. It should fit on just about everyones bikes.
The gearing is as follows.
Typical Happy Time - 10t sprocket & 40t gear = 4:1
I currently have ratios between 8:1 and 3:1