Chipper - great project. I'll be watching.
I want to build one, too. I have the 20" bike front end already cut down but I am trying to identify the right tires and wheels to fit the 10" pvc. Could you post some details on the wheels and tires, specifically the part numbers if available so I can order.
Also, I'm interested in what size axle you are using - 1" x 40" or ?