Inspect the bottom two holes of channel F-1203G for LP4-3 rivets. This vertical channel is inside of the cockpit against the outside skin and it is riveted to the F-1203A bulkhead below the pilot's knees. Step 3 on page 23-04 says to rivet this channel to the bulkhead, but there are no rivets called out for the bottom two holes. If you missed the note elsewhere on the drawing where it says to use LP4-3 unless otherwise called out, you might have left the bottom two rivets out of F-1203G. Once the side skin is in place, it is much harder to rivet.
Joe
Joe