looks like you're in for some work.
Westend and the others have already stated, there is a lot that you're going to find that you can't see yet.
It took me a whole winter to get my '76 Shasta in useable condition. And that was repairing/replacing with working items, and not trying to source/refurb parts that were"time correct"
That being said, there is a minimal investment for a lot of that, most of your parts can come from a big box store, for a small price. The elbow grease is what adds up, and find a friend that's handy and a good set of wood clamps.
Honestly, looking at your pics, it would be borderline if I would take it on as a project, that whole floor will turn out to be shot, the lower couple feet of most of the uprights, certainly the corners, and expect a number of the roof joists to need replacing as well. You'll have that thing down to the shell in no time, and I can say from experience, water damaged cabinets and such never go back like you hope. I'll be following this one, good luck.
