Tadpole style recumbant - with the rear single wheel doing the steering with the front two wheels fixed - plausible? Answered
Now in a way you couldn't really call this a bike anymore, as it will not be pedal powered. Instead I am gearing one of my wheelchair motors left over from one of my robots to power the rear wheel. It will be kinda like driving a boat on land. So... am I nuts for trying it this way. Included a quick BASIC concept sketch.