I should have mentioned I made a little more progress last night: the driver's vent window arrived (from a local auto recycler) so I cleaned it up a bit and got the door stripped in anticipation of installing the window.
I also cleaned the interior a little more. This is how much dirt was under the floor mat/sill plate in the driver's kick pad area (passenger side was similar):
I also continue to find live ammo as I clean the interior, which further speaks of the truck's transformation from "city slicker" (when I had it) to "ranch truck":
These were under the seat:
Lastly, I found another photo of when the truck was new, which I will post here: