Nice - I did the same thing, and then spent a long time trying to decide the shape of the cab, and all sorts of details regarding the CP. This is the danger of having a working prototype - it can seriously diminish the compulsion to move forward. In the end, I realized progress will never get made without progress, and the easiest way to move forward was to follow the UAII plans in the book. And after tinkering with CP ideas, I settled on the 4P I have now (some might call it a franken, but 2P Smash TV and 3P Super Offroad were important to me)