Great Flying Plane!
I have OS 120 III with pump. Used 90 degree header with flex pipe to put outlet out the bottom. All else is stock. About 30 flights with no problems. Reinforce the wheel pants inside with some glass cloth, throw away the mickey mouse tires that come with it and put 1/2 inch larger real tires on it. All else is great. Flys like a low wing cub with plenty of power.
Enjoy.
BobHH