I just received a Roto 35 to install in mine, it fits really well, not much of the head will stick out of the bottom. Hooking up the throttle and choke linkage will be a trick though. Like V-snap I plan on intalling the Elevator and Rudder servos in the tail for balance. I have a 3 blade prop to help smooth out the motor. Are/did you guys use the stock landing gear, it seems soft?