Tom,
I sail a Kitty (my first R/c boat, first yacht, first scratchbuild) sail servo is a perfectly standard servo with arms extended both ways to about 4 inches both sides.
One side works the main (with double travel) and the other side works all 3 jibs (Yes, purists I KNOW they are called different names on a TSB). The men of AMBO are perfectly clear that you do not need to control any of the headsails, and Richard Cheyney, I seem to remember, controls only the vangs - not any sheets on any sail.
If I were rigging from scratch I would use 2 standard servos, one for the main with a long extension (under the main hatch) and another in the fore-hatch for the headsails. I have 2 sheets on the foresail and jib (one each side) led through the bulwarks to the servo arm and just one on the flying jib (Jib topsail) thru a ring at the hounds and down to the Servo.
Pics available if they would help you
Nice job, BTW - thanks for showing us. Do you have motor fitted?
andrew