Hey these are great! I saw a Discovery channel program where a bunch of engineers got together and built two of these puppies to demo the different styles, explore how they worked, and see which model was better. What you have in your version WOULD have wheels to counteract the motion of the weights. The one without the wheels would have the counterweights in a basket that would swivel as the arm went overhead, keeping a relatively straight path. These are way cool. Keep at it!