All of these posts have some great merit. Take a look at the design of the airplane, rather than taking the whole thing apart and re building dihedral and rudders and etc... you might be able to throw a couple of mounts inside the wing, run some wires through it and run individual servos to the ailerons. with the advent of micro/mini servos so much is possible. I might even consider cutting servo mounts in the aft part of the fuse and running individual servos for Rudder/elevator. Just oppose them with arms on opposite side of the fuse. Typically models especially fast models are easily flown with aileron and elevator. Rudder may be used for aerobatics, slips, coordinating into cross wind etc.... but you can get away without it. Rudder in full size airplanes predominately is used to coordinate turns to prevent a sliping, or skidding turn. in the first post the gentleman mentions side slip, what he is actually describing is a skid, when the nose of the aircraft falls in the turn. This is a great reason to learn how to use your left stick and apply it other than using it as a throttle hand. So if it were my airplane, Throw some ailerons on it cut some opposing holes in the aft of the fuse (strengthen the area of course) hook up rudder, aileron and elevator. Then throw a throttle servo up there using the same method. Then go out and have fun. Micro/minis should be more than adequate for torque and will save weight also. AS far as cg goes for me I HATE MATH so if you balance off the main spar youll be in flying CG range 99 % of the time. or you could be figuring out stations, weights, arms and moments which is a pain in the arse

enough blabber LETS GO FLY

JB