Ok, now with the wonder of electronics here is how my three piece wing is attached on a 10 foot Fokker F27.
The center section contains the engines and flaps and the servos for the outer ailerons. The aileron slightly overlaps the center section, so I only have to connect the linkage and not electrical. I used a dowel to prevent rotation and two Allen screws to secure the outer wing section........So far it has not broken off.......Tomorrow is another day.
Hope this helps.
Twinman