Section 15-1 through 15-4 is Left and Right Rear Spar building. I built the inboard aileron bracket and deburred, prepped and Alodined. Built the outboard aileron bracket assembly, deburred, prepped and Alodined. Match drilled the rear spar doubler plates and deburred, prepped and Alodined. I cut the aileron pushrod hole in the W01007D-L outboard rear spar doubler the same shape the rear spar had. The manual describes the hole to be shaped rectangular but I didn’t see an need for it to be that shape.