Connery, I am in the process of building this exact plane from an updated plan. There is 2 degrees of right thrust. The plans tell you to offset the engine on the mount to get the 2 degrees. You could mount it up and just shim the mount some on the left side to get the right thrust. I am going to try mine without the right thrust first. If it needs it then I will shim some in. There is some down thrust that is built into the fuselage. The firewall gets glued to the sides at an angle set up by the fuse doublers. Just mount up the engine and have at it. You are right, a 40 to 46 for training. A 60 for airobatics and advanced training. I have a brand new Irvine 61 for in mine. I converted it to taildragger configuration. Going to use a Dubro vibration reduction motor mount. I am going to have to modify the cheeks to fit the mount. Also using Robart hingepoints and Robart control horns. Otherwise building it stock. Good luck with your trainer 60

Mark Shuman