Thanks for the information. I also used the TF P-47 century retracts and 3 1/4 robart wheels. You do have to carve up some of the ribs and spar, but I did rebuild it back up around that area and fiberglassed it to hold up. Did you have any balance issues with putting the air tank that far aft? I filled the front with foam insulation and had it form around the air tank and fuel tank that way it makes a perfect fit and nothing moves around.