If you are building, consider putting these nutplates on when you prep the main spar. Sure wish I new then what I know now. I might go back and update a blog entry so that others who read this have the option of looking forward on this one. (Note: if you put the nutplates on you will need to drill the Root Z-bracket to the spar first)
So the left tank started with final deburring and fluting of the ribs, just like before. These ribs don't get primed because they will be inside the tank. I did end up cutting the tank stiffeners for both tanks and smoothed them all up. These guys go between the ribs on the bottom of the tank so that the skin doesn't sag due to weight of fuel., Here is a pic of them cut up.
I read other web sites and determined that for the first assembly of the tank it was easier to start it outside of the leading edge jig and get a few clecos in place. I worked the upper and lower leading edge of the tank as everything began to take shape.
Most people know that the tanks on aircraft are in the wings, but few know that the tanks ARE the wings. Basically this section of the leading edge gets sealed up with a sealant, and is the tank. Pretty cool and effective..