Looking at that the doors are the least of your worries. You need to be stripping that right down.
Hex bolts were so rusted they were a nightmare to get off. I tried heating them but I ended up rounding some of them because they were so knackered. Luckily the door frames were so rusted I could get the dremel in and cut off the nuts.
If you haven't already got a list of tools to buy may I recommend these for rusted nuts
https://www.machinemart.co.uk/shop/product/details/5-piece-bolt-grip-set
They'll even work with an impact gun
If you haven't already got a list of tools to buy may I recommend these for rusted nuts
https://www.machinemart.co.uk/shop/product/details/5-piece-bolt-grip-set
They'll even work with an impact gun
+1. Well worth the money.
And that bulkheadI can't even begin to describe what I think.