nice looking with the new wheels and innovative. However I don't see why you would have needed the replaceable hanger for this setup. In fact you have now defeated the benefit of that replaceable hanger. I think that the drop outs are now so strong the derailleur is the weakest link hopefully. Non the less a great idea to be able to use other spaced wheels when you want. Did the two spacers equal 15mm or so you have to machine them to get the right dimensions.