IH8RUST .... take a close look in the passenger footwell...looks like water has been laying in there for quite awhile with the stains on the carpet. The door threshold trim pops right off with 3 plastic push in clips underneath. You can usually pull the end up by the pillar with your fingers or a screwdriver to pop the first one and then move forward to the kick panel and pop it out to lift up that carpet.
I personally wouldn't touch anything with perforating rust in body panels at any price, but that's just me and being fortunate enough to be able to pay a bit more for the right rig. That said, even with paying somewhat of a premium for an extremely clean AZ rig that had a bunch of mods that I would want already, I ended up re-doing all of the suspension, rebuilt diffs, pretty major maintenances, etc., etc., etc.
And I agree on value based on the limited info...$5k and then $10-15k after purchase to baseline. It's easy enough to say it starts and runs fine and can drive around in a field, but once you get out on the road and realize that the tires are shot, bushings in what seem like 100 suspension links are toast, hoses are crumbling, etc....if you have wrenching skills and a decent set of tools, it's basically all do-able yourself at home if you feel capable. Also, keep budgeting in mind if you plan to lift or keep stock...lift = Mo $$ for sure if done correctly.
Not trying to be negative here as it is a decent looking "barn find" (aka "deferred maintenance") rig...just check on that rust under the carpet and make your informed decision from there...solid floors are a huge +++ on this one!