Two holes and you're still nose heavy? I figured with two 1 inch holes and a 1/2 dozen 1/2 inch holes I'd balance OK. How are you going to route the servo leads? I'd hate to have them just running down the side. How do you plan to re-inforce the balsa fuse for a servo mount? What servos? I've got a pair of HS-225 MGs I hope to use. What else are you changing?