Cut the F-728B and F-729B angle pieces from stock and finished the ends with file and scotchbrite. Assembled the center section F-706, F-730, F-728 and F-729 and match drilled parts. Disassembled and deburred all holes. Clamped the F-728 and F-728B together and match drilled the angle. Took care to make sure I had sufficient edge distance on both ends. Did the same for the F-729 and F-729B. Disassembled and deburred all holes.