The root and tip ribs are covered with plywood, making the plywood pieces for the aileron section was fairly simple.
I used a rib as a template to mark the outer edges of the aileron section onto the RS-535. With a little measurement I marked the center pivot hole. Used my circle cutter, setup to same dimension as the aileron nose ribs, to cut the radius on the front.
Once one was completed I used it as a template to make the other three. The center hole needs to be accurate, I used the first one as a drill guide to make sure all were identical.
All four turned out great.