The current prototype is still under construction and looks like it will be finished before the end of the year - in order to win my wager with Bill! I have built a new wheel stand for this model because the previous one looked so bad when compared with those I see posted from time to time and I anticipate posting pictures of this one, working or not. The bearing supporting the wheel has been improved with the addition of a bicycle front wheel bearing and there is very little friction to interfere with any spontaneous rotation that might occur - I wish!
I have argued repeatedly that friction should be the least of our worries because we wish to build a wheel which will do work, and therefore overcoming friction would be a breeze. But I have to admit that seeing the new backplate spinning easily and without the lateral wobble which seemed to be an intrinsic component of all my previous models, I'm now converted to relatively friction-free assemblies. The wobble I referred to had a tendency to throw my previous mechanisms into disarray, so it is all to the good that it has been eliminated. I remain confident that this design will work.