Starting center fuselage: rear spar and main spar

TLDR

• Lots of rivnuts on floor ribs
• Rib onto main spar

Details

Rivnuts

I installed rivnuts to all the ribs that goes onto the main spar. I think there are 30 of them.

Rivnut on the center box

Connecting to the main spar

Test fitting the ribs

Added the center box

Added the smaller ribs to main spar

All riveted

Riveting the ribs to the center box was a pain. The ribs were a tight fit to the box, and the holes were all just slightly misaligned and I needed to use an awl to wiggle the holes with quite a lot of force in order to get the rivets to fit.

And riveting the smaller ribs to main spar were also pretty painful, mainly because of the tight space could fit my rivet gun.