4.3 hrs, 104 rivets
The TdF is keeping me from the project. But today, after airpark work morning, decided to skip running, and got to work on the project.
Made up a set of styrofoam cushions for the aft fuse. These will go in place when I have to get back there for maintenance. They raise the floor level to just above the ribs, so there's almost a flat floor back there. Throw a cushion back there, then it's just an excercise in claustophobia therapy!
After that, drilled out the rivets from the 787 rib to the 707 bulkhead. These will be in the way when riveting the 7112 skin into place.
Then, finally, after months of delay, started riveting the 775 aft skin to the fuselage. Got a fair amount done solo, but now it's time to get some help.

After I couldn't reach rivets anymore, fabbed a doubler for the transponder antenna.