Seeing that radio would of made my pupils pukker a little

as stated above
Take a real good look at both inside kick panels
like in this pic of my truck. Those ripples next to the parking brake pedal indicate
rust With the seat out you can inspect the cab corners real good from the inside.
and check out the
door pillars. Trucks that have been sitting for a long time tend to collect dirt and mud there and
rust outDon’t let my pics scare you rust in those areas are common and very
repairable Overall that truck looks cool from the pictures, Inspect it well, check out the title and what vin number is on it. Is it the door pillar tag number?
I wouldnt worry to much about all that electrical. If you get it youll end up pulling it all out for safety reasons.
Good Luck