Well guys I have one also and I have a OS90 in mine and a used one of harrys brass nuts to hold the prop on (12/6) and to help balance. The engine is installed inverted that way I didn't have to butcher the cowel so much. I also cut a hole in the fire wall and made a fiberglass tube that goes from the fire wall back to the tailwheel. The belly pan comes off and has part of the tube in it this way no fuel and oil will get inside the plane or on the belly of the wings or the belly pan on the inside. Also the turbo scoop aids in the exhaust of the hot air from the engine. So far this system seem to work on the ground so far. Too high of winds to test fly yet. I also put 3" wheels on mine and replaced the gear wires seemed to bend pretty easly. Also was able to make gear doors for the gear that are a little more scale and also the inner doors but havent figured a way to make them close with the wheels. But they do have springs to make them open. Thought about the flaps but guess I will wait till after a few flights and see how she handles.