My next project is a WM Extra that I purchased before I crashed Pitts-I. Then I put the Extra back in the box and bought a new Pitts kit, and as you know, just finished it last weekend with the maiden flight. So, I will be working on the WM as my winter project. Putting an OS 160 FX in this model with Futaba 9202 servos on the movable surfaces. I have read several post where guys say the 160 is a bit light power wise for this airplane. A guy at our field has one with a 160 and it flies very nicely with this engine. Just need to concentrate on keeping it as light as possible during assembly. Good luck with your decision. Hey, what about the U-can do 3-D model or the Funtana?