Finally go around to finishing up the tunnel access. I was putting it off a bit because I really don't like #8 plate nuts. I dimpled the ears then straightened them back out a bit. Then cleco'd one ear and installed the #8 screws. Then riveted the other ear. They all came out really good, happy with the results. Riveted the reinforcement ring to the tunnel rib and screwed in the cover plate. Done.