Just make sure you used loctite on the bolts or yes back them with nylocks as aaxiss has said 2 switches one for receiver and one for ignition A123s would be great. Oh and one battery will most likely go on the engine box the one for the ignition and the battery for the receiver back by the wingtube !! Use metal arms on all the servos I think Tom has them if not TBM has some good ones the 1 1/4 arms work great and a 3 inch dual for the rudder and run a pull pull setup and the balance will be very close have fun she is a great bird. Enough for now I am going FLYING !!!!! The 3MM is getting stronger and stronger !!!