Just one little observation...
I would like to suggest one caution concerning the general advice you are getting that stuff does not have to be brought up to current ABYC standards.
Sidebar: If I were surveying it, I would be mighty cautious about being quoted to the contrary...
A good surveyor advised me, while I was upgrading our shorepower wiring, that for
safety-related stuff like electrical and fuel system, there really is
no "grandfather clause."
The example here is that I was checking out our shorepower circuit and found that the wire run from inlet on the cockpit combing forward to the main AC two-pole breaker was over 10 feet (it is supposed to be less than 3 meters, IIRC). So I put in a new breaker right behind the inlet and ran a new 10/3 marine cable to the main panel. Safer now and surveyor-proof, as one might put it. There are project pix over at the Ericson owners' site.
Note B: while stuff like wet decks or rigging is often in excess of what us ameatures might try, most systems work just takes patience and a reasoned approach, and several good quality tools.
Happy boat hunting.