First thing is to unf*ck that chrome license plate lamp, Airborne!
Being in NC, there are a lot of Defender guys about. Aski somebody to come over and do a thourough assessment of the truck. Figure out if frame needs work. See where body needs help. Then you will know your baseline.
In looking at your pics, that tub is done.
You are looking at all new cappings, sides, rear panels, and this is without seeing floor/
The bolts for the rear into the crossmember under the door are missing, means the steel angle under there is prob shot. The rear panels and side panels are all starting to corrode and have damage.
More pics would help:
Inside the truck, where the seat belt bolt to floor.
Directly under that where the seatbelt bolts come thru, and the sill bolts to B pillar.
Hate to say it, but front of sill, where the bulkhead and sill connect.
This will help people here to give better advice. And who knows, someone might have a tub, or cappings laying around.