Seats and bottom seat belts installed

I attached the rails to the seat floors:

Right seat rail installed in place

Left seat rail installed in place

We installed and removed the seats a few times to be able to more comfortably on the panel and tunnel, but they're yet to be installed permanently (for one, I need to connect the sticks underneath them before I can close up that section).

I also got everything ready for installing the seat belts, including final-drilling all the attachment point holes, and inserting the bushings into the seat belts themselves (which the dimpler with a socket as support was a great tool for):

Seat belt ends with inserts installed

For the cabin top attach point, which uses a 5/16" bolt, the bushing would be very thin - so instead I called Crow and they sent me ends with a 5/16" hole, no bushing required (which is fine since this one doesn't rotate anyway):

Original top seat belt end (left) vs new one with a smaller hole (right)

With this, after the interior panels were in place, we permanently installed the seats and the bottom seat belts:

Forward seat and forward bottom seat belts installed in place

Rear seats and rear bottom seat belts installed in place

The top seat belts are the only part left, and will be done after the O2 tank is installed in the back, and once we get hardware for the top cabin attachment (the standard NAS517-5-9 is too short with the headliner spacer).

Time lapse:

Total seat and seat belt time: 12.4h