Well that certainly makes me feel a lot better about using the aluminum frame! I won't use the rubber I have for sure then. I actually am going to use my current schwinn bike to mount the motor
Hopefully it fits though. It barely makes the specs for that image dipicting 11" between the bottom of the top tube to the bottom of the down tube. If not I'll get another bike which isn't a problem. I would use this GT avalanche 2.0 I have but the downtube is not the regular circular tube, it is widens out to much more oval like as it goes down...... I'm trying to sell it, hopefully can get it gone soon I don't like it that much. Has a front disc brake and boy I tell you those brakes are wonderful!
I do have a thread on it though..http://motorbicycling.com/f6/flat-downtube-35553.html
I love the way your bike looks, rugged and strong. Takes on the elements!