The top flange is bent though 98 degrees to form a 82 degree angle to match the slope of the top skin. The bottom flange is bent through only 85 degrees to form a 95 included angle. The details can be found on the left hand side of drawing 5.
The rivets on the inboard and outboard sides are easily located to maintian edge distances. With doubler 1/8 short, the rivets need to be 1/4 from the edge of the doubler rather than 5/16 from the bottom rear spar flange in order to maintian ED.
The problem locating the holes for the aileron bracket is trying to maintain ED on the doubler and the aileron bracket mounting angles especially on the shorter one.