Thats nice! It looks like it was cared for then abused....leaving openings like that and having any type branch rub the skin. I'd say plug it in and see what works....you can't hurt anything. Then, check plumbing for major problems...and hook it up. Check for problems to fix. Again, what can you hurt. THEN, figure out what you REALISTICALLY going to do. Please don't be one who tears everything out...THEN realizes the magnitude of the job. Lots of great help around here when you need it.
"If it can't be reduced, reused, repaired, rebuilt, refurbished, refinished, resold, recycled or composted
then it should be restricted, redesigned or removed from production."