Aidan and I kept going on riveting the bottom skin. We got another 4 rows done, since we have to keep pivoting the wing to different angles to assist in reaching inside with the bucking bar. My back gives out after a couple hours. Heres a video of us after we got our technique down. We drilled the holes around the perimeter of the hatches and added nutplates along the edge of the tank bay in line with the 5 rows of skin rivets done thus far..

https://youtu.be/vPAOu24NJd4