Scott,
thanks for checking the thread.
you're correct there is no way to get the leads in front of the spar without a hole. I have two. One small hole out in the aileron servo bay and one close to the wing root. The spar is a lamination of ply at that point.
while typically I would avoid drilling through the spar but with the layup of these wings I don't foresee any risk.
it was quite easy to run all the lines out to the aileron bay, then I used a nut on the end of a string to find the path out the root. Then I used this string to pull the leads through.
the connection points are all low to avoid interference with the fuel tanks. I have blocked those up slightly to provide clearance.