It's been done before (not by me, though) - I'm pretty sure you'd have to sacrifice the circuit board inside, but beyond that, just provide some kind of platform with cut-outs for servos that you can stabilize in there.

As for the control surfaces, you could axe the V-tail, and construct your own conventional rudder/elevator setup (that, I have done) if you don't want to fool with mixing, but to tell you the truth, I think as long as you connect one servo to each flap on the V-tail, your transmitter should be able to take care of the rest. Even my low-end, basic, Hitec Focus 3 has mixing and elevon switches on the back...

Dan.