Just additing to my previous post with a few additional pics. Image 2 shows the underside of the inboard bracket platenuts and the working side of the rivets. As mentioned before, it was fund getting out the rivet gun again. I used the squeezer for all of the bracket platenuts, but the inboard rivets were just too deep to use that method.
So off to DC for work this afternoon. I have the fuel tank ribs with me and I plan to clean those up and ensure they're perfect for constructing the fuel tanks. Will need to do that in order to drill the top of each bracket for attachment to the tank.
Right wing spar, underside of inboard platenut rivets.