I used mini servos for the throttle, elevator halves and rudder. Standards for ailerons and battery is mounted just about under the canopy. With an OS .50sx and this setup I have had no CG issues. All the servos are mounted per instructions. I called DP Models a few months ago and they sent me some decals for the Ultimate. Having never setup pull-pull for the elevator halves and rudder made it an interesting install.