I did use 2 miniservos for ailerons and two miniservos for elevators, I also used a bit my dremmel to cut here and there and final weight came just fine, mine is powered with a Saito 91. My battery is placed also at the tank's hatch and it can do 3D maneuvers (Like hovering) with the battery at the CG. It gets a lot nervous and very responsive (Not my style at all) and decided to put the battery in its original position (Tank's hatch). This is a very fun plane, and properly trimmed will keep you for hours in the air. (Remeber to refuel)