I was able to work a little longer session tonight and completed the prep work on seven pieces. Below, are the completed F-01407-L & R Bulkheads, F-01408-L & R Side Frames, and the F-14115 Rudder Cable Bracket.
I Final-Drilled a the #40 nutplate attach holes on the F-1037B and F-1037C Battery Angles. Then, the nutplate attach holes on the battery angles were countersunk to accept AN426AD3 flush rivets. I clamped the angle to the workbench and elevated them by two pieces of 2x4.
Here are the two completed Battery Angles.