For me, I hate setting the horizontal stab and squaring up the wing.
Absolutely hate this step.
Brian,
I'm surprised no one picked up on this? It appears as though you put the wing in after the tail feathers? Did I read that correctly?
I always set my wing in place first. Totally in place, screws and all. THEN I set my stab measuring off of the wing. If the stab is square and aligned, the vert stab is easy to put in place.
I really live to build, especially scratch building, but I have never made two left or two right wings by mistake.