It's not the final version, but here is my result from the plans. Edit 4/4/10 I never "completed" this version. This machine is now long gone, but I can't say it was satisfactory. My "genius" idea displayed in my plans in the previous post was to use the power of two motors to go forward and steer. The steering was achieved by moving only one motor forward. However, this steering scheme was not very maneuverable. Imagine, if the machine got fit into a corner with no room on the sides, getting out would be difficult, if not impossible.
Nato