Worked on the fuel drain and the deluxe locking fuel cap.
The fuel drain was secured onto the skin using a bolt and I drilled the holes with #40, cleoced and continued until it was completed.
The fuel cap flange was marked for centre and a line drain across the flange. The mark was lined up with the two middle holes, clamped and then drilled with a #40. I drilled, clecoed each hole and moved along until completed. No issues.
Fuel drain drilled and clecoed in place
Fuel cap flange clamped in placed with the centre lines showing through the rivet holes