I have mine about 95% done. I went with the ZDZ 40. If anyone uses this engine on this plane, the BCM muffler is too big for the cowl to fit over so I ordered a slimline. If you use the ZDZ mount it must be cut to the the size of the firewall. Also, I snapped two clevises, and good luck finding one to replace it. It's metric. I replaced mine with all 440 stuff. I also went with all JR 8231 digital servos except for throttle (It's what I had lying around). The wheels that came with it were crappy and small so I changed them with Du Bro 4.5 inch. I tried 5 inch but they were too big. In any event, the engine does fit inside the cowl and the only cuttin needed will be for cooling. Overall, the plane is awesome and look forward to flying her this weekend weather permitting.