You will really enjoy the way it flys once you get your engine sorted out. That 40 should be plenty of power. For anyone starting to build one of these I would recommend moving the servos up front and use some carbon fiber rods running to the back of the plane for the elevator and rudder. I might even do this over the winter. I have a pte 36 size engine in mine and had to put a good pound on weight straped to the bottom of the engine to balance it out. A buddy of mine who use to fly pattern for years flew mine the other day and fell in love with it. Said it was one of the nicest flying planes he has flown it quite some time.
Jeff