I don't have a picture for you, but there is usually some 1/4" plywood blocks, maybe about 1" square, which are epoxied to the fuselage sides with some tri stock reinforcement underneath. The plywood blocks are drilled and tapped for 1/4-20 threads, and then the threads are hardened with thin CA. I like to run the tap through again after the CA dries, to clean up the threads. Make sure that the blocks do not conflict with your torque rods.

On the wing, there should be a thin (~1/16" ) plywood plate that covers the bolt area of the wing, and you drill holes large enough for the 1/4-20 bolts to pass through cleanly.