I definitely agree on putting the aileron servos out in the wing. Just make the hatches about halfway out on the wings and use the covers for the servo mounts.
I activated the upper wing ailerons with 4-40 rods between the trailing edges of the ailerons. I used 4-40 throughout except on throttle where I used ny-rod. Pull pull and split elevator sounds good, although I didn't have them on mine. If I were doing it again, I'd definitely do the pull pull and possibly the split elevator as it makes fine tuning that surface much easier.