As much as our hearts are warmed by threads like this I wish more of us could do the hard work of being real about someone's chances of making something like this work. The o.p. would have been better advised to get a recumbent trike. Maybe an upright trike but some kind of stable human powered vehicle. I personally would have recommended an elliptical machine and some kind of effective rapid weight loss method of losing at least 200lb. before thinking about a bike purchase. What is anonymity and a total lack of any accountability good for if you can't use it to be brutally honest and therefore helpful?