Hello, I've seen your bike at bicycle forums and it's even been a topic between myself and a few bicycle mechanics/acquaintances from around my city a few times over this past year. It's a really cool concept. I don't want to bash your design too much but, I'm curious about the bicycles geometry in terms of general control if a person were to ride the bike. As I said before your concept has been a topic between fellow bicycle mechanics (myself included).
Some of us still mention your bike from time to time and were still puzzled by your forkless design. How does a person steer the bike? We thought that... (based off your design) the bike would turn sharply but, simply tilting the front wheel doesn't do much. So, we decided the turning radius was wide, really wide; doesn't make much for city bike if a person can't navigate around sharp bends and turns on the road.
We also looked at your hubless wheel design and friction drive on the rear wheel. Most of us aren't engineers (well except two others) but we believe that a hubless setup on the rear wheel isn't as efficient as a hubbed wheel in terms of power and torque transfer from the rider. In fact we speculated that the rider would be working 4-5 times harder than on a recreational bike (standard mountain bike from Toys 'R' Us or Target).
I'm going to stop, because I said I wouldn't butcher your concept. The bike is still awesome, needs a little revision on its mechanical design but... it does have potential for real world applications.