Unusual handmade bike

The idea of creating this two-wheeled transport have come to me 12 years ago and 7 years later I'm going to start working on it. The first thing that attracted me in this bike was its unusual frame. At first glance it seems easy to manufacture but during work there appeared some difficulties and there were small subtleties in making of such frame.
template: yadi.sk/i/XrV_...