The first photo shows the bottom of the wing. In the wing are the two aileron servos, elevator and rudder servos, flat battery, and radio receiver. The second photo shows a detail of one of the servo access doors. The servos are mounted to the inside of the door w/rubber two sided tape and a tie wrap. Note two 4MM Dia. bamboo skewrs. After the door is closed the bamboo skewrs are pushed into the wing and lock the doors in place. The door is made by cutting three sides and scoring the fourth side from the outside of the wing to provide a hinge side. No cutting at the hinge for added strength. At present performance at take-off is marginal but weekly improvements are being made. One engine out is no problem. Still experimenting with best location of the CG.