Match drilled the counterweights and counterweight skin to the counterweight rib assembly. They turned out alright, but if I did it over, I would start the holes in the counterweights (I.e., drill about 1/8″ in) and then finish them on the drill press. It’s very important to drill these straight as possible. I have one hole that is off by about 1/32″. Still within tolerances, but I can see it going a whole lot worse.

Assembled and ready to be drilled.    
All done:

Next, I clecoed the elevators together to get ready to match drill the skins to the understructure.