A little late here, but just in case.
I tryed using the wire with the flex tubing. I did not work, trying to make a sharp bend just did not work for me. I made two small mounting blocks out of balsa, about 1/16 thick. I epoxied the blocks over the servo cups I cut out of the wing.I then mounted two servos in the wing, one for each aileron. You are basically counter sinking the servos in the wing and using the balsa as a way to hold them in place.

Andrew