Here's my conversion of the Multiplex Fox - I cut the fuselage in half and replaced the rear half with a couple of bamboo skewers and some balsa fins. There's an AR6100 buried just under the leading edge of the wing, the ailerons are controlled by torque rods and the elevator by a servo in the wing with a long push-rod. The motor is a small brushless I bought for indoor 3D a couple of years ago with a 5x4.3 (instead of the 6x3 that it uses for 3D). AUW with a 2s 400mAh battery is 95g but it has also flown with a 2s800 at 120g.