I took the fuel tank today, theres plenty of crud in there, its rock hard black stuff stuck to everything. So tomorrow i'll wash it out, and see if the fuel pump works, and replace the fuel lines. No rust at all where the fuel tank sits

yey
I also took the back end off, and the exhaust, to turn the engine over by hand, the oil was like new, and the engine turned over nice and smoothly with compression.
I drained out the coolant, it looks like it was a heavy mix of coolant, so no rust or crap came out, and the water pump turns over with no grittyness. Only issue was the alternator was seized, so i coated it in Duck oil, and it now spins
Both doors open fully, and close easily with very very good panel gaps.
Looking round the body, i found one dent, where the filler had sunk, which is where the passenger side wing mirror mounts, it must have been smacked and dented the door a little.... so should be ok under the paint.