the Saito fits perfectly in the cowl. I will attach pictures of the front for your review. I used Futaba s3004 with a six volt battery. It gives me 58 oz of torque on each servo. I also used servos in both wings instead of the slave hookup. I read too many posts regarding having trouble getting the slave bars to align. It flies great though.

I put the engine in inverted, and only had to cut enough from the bottom of the cowl to allow the muffler to get through. I also cut out a section of the dummy engine, as in the instructions, to allow some air flow. Let me tellyou, there is no worry about power with this engine!

Good luck.