I've been giving a lot of thought as to how to drill these angles, I finally decided that the way I was going to do it is on the drill press, on an angle.
I scanned in the rudder pedal into AutoCAD to find the angle geometery of the pedal. Using this information I was able to create a template that I could use as a setup for the drill press...to drill the correct angle.
It is a tedious process but I managed to clamp each F-6115C angle to a wood block and then open up the #30 holes step by step to a 3/16" reamed hole. The result once the assembly is cleco'd together is that the holes lined up fairly well....very small adjustments needed to make the bolts fit very well.
I then started trimming the 45deg angles at the bottom of the pedals.