Finishing the gas tank

The past month I have been working on riveting together the gas tank. Since there is several thousand holes in the tank and they all have to be sealed, it takes a while. I started with putting together the end rib, fuel pickup, anti-rotation brackets, and vent line. I also made all of the bottom stiffeners and then back riveted them to the tank skin. Next comes installing the ribs. I did two at a time so that I don't make too much of a mess with the pro seal. Once I got all but the inboard rib installed, I fab up the vent line and installed that. Then I put the last rib in place and hooking up all the plumbing. After that comes the back baffle plate. I have access holes in each bay so I can come back if I ever get a leak and seal it up. It's extra work installing all those nutplates and covers, but it makes gaining access very easy. Once the baffle was installed, I started sealing up the access holes with the covers. I finally got the whole thing sealed up and I am now starting the final fitting of the tank to the wing. This consist of getting the tank strapped back down and installing all of the screws. Some of the rows are already dimpled. The rest have to be machine countersunk and this takes time. I don't countersink the hole all the way. I leave a little left that I can shave out with my deburring tool. I have had the countersinks plung way too deep even though they are set to depth. The other thing I do is grease all the screw threads before installing them. This helps lube up the nutplate and keeps it so the screws don't corrode in them. Also, using SS screws, you can get dissimilar metal corrosion so this helps with that as well. I should have the tank done by tomorrow and then I will start getting the wing prepped for the main skin.