First up, the bridge. Its in a hell of a state, I don't know if I can free up the screws? If not, I'm thinking of treating with a dash of penetrating oil (careful of the body) over the period of a few days and then gentle persuasion with the screwdriver.
Dissassemble, try to clean back the rot and see if the components are still usable. Possibly replace with a quality aged replacement.
Any thoughts?