I still needed to inspect the rear seats, parcel shelf, engine bay and more thoroughly look at the rear wheel wells.
The first sign of trouble was when I found a solid steel, but it was only held on with bondo!
It looks like there has been major repair in the passenger side door jamb,
with a visible (un-welded) seam at the top
And some fiberglass filler covering another seam. I can't imagine why you would use fiber glass there, but I'm sure it doesn't bode well.
On the driver side, I didn't see any major issues with the door jamb, but another fiberglass patch fell out.
I really started feeling the overwhelming sense of doom when I found some really heinous rust right at the base of the roll bar.
I gave up and started getting ready for work when the screwdriver that I'm using as a probe went straight through
It seems like this will entirely torpedo my idea to stick to the bottom half of the car. I'll have to do some more research to see if any of this can be fixed from the inside and to generally quell my sense of doom.