I reinstalled the panel in the fuselage to check fit and finalize the brackets. Removed the bulkhead and drilled the angles to the bulkhead with #40. Reinstalled and cleco'd the angles. Then marked and drilled the angle for the bracket. Marked and drilled the bracket. Reassembled and cleco'd to check fit. Repeat for the left side. Cleaned up the brackets, rounded corners and drilled a litening hole. Then drilled all pieces up to final size and deburred all holes.