In the flap plans, there are a few callouts to fabricate tools and jigs to countersink and drill the trailing edge at a precise angle. While outright precision probably isn't necessary here, I decided to hop on the CAD and 3D print all these parts instead of fabricating them out of aluminum.
One challenge was machine countersinking the trailing edges. I noticed that Cleveland Aircraft Tools sold a jig to hold the trailing edge at the right angle to use a countersink cage with. $42 seemed like a lot for such a simple part, and I decided to draw one up and 3D print it also, which worked great.