This is not hard, let me use a Giles 202 I have as an example. It only has one rudder servo and no payload drop but it does have 4 aileron servos, 2 elevator, rudder, throttle, and choke. I have programable Hitec servos which helped. I do have everything in a single 7! channel with a DX7 which has much less programing than almost all 9ch radios. I have a Y in each wing and one wing goes to aileron, the other to flaps on the receiver. Use the programer to match the servos. One elevator goes into the elevator ch. and the other in the 7th channel (I should have programed it reverse and Y'd it to the levator channel, rudder to rud, throttle to th, an I have choke to gear whicj you woul pu the payload servo into.

Granted I have the programer but I have done others without it. I also have two NiMh packs going though two switches into two seperate pors on the receiver for a little safety.