[Jeff_H]

I am not sure what to tell you about the Keel bolts. Keel bolts actually deteriorate where they pass through the fiberglass because of oxygen starvation. Surface rust is not much of an indicator either way.

I can''t recall if the Tartan 30''s did have cored hulls. At some point Tartan did start coring its boats but I am sort of think this predates that period. The easiest place to spot coring is at the transom where it meets the hull. Generally they will end the coring a few inches from the corner and you should see the taper. I have no idea what the deck coring would be. C&C, which had close ties to Tartan, was a pioneer in using foam coring in decks (more expensive and not quite as strong for the weight but superior longevity).

A marine ply core at the chainplates will reduce crushing of the deck but marine ply is a little rot prone and so all edges should be saturated first.

The three big issues are the chainplates (which may all be shot if the broken one was not from trauma), the "serious whacks below the waterline" and the missing lead.

I am not sure what you mean by some "serious whacks below the waterline". What kind of Whacks?

I am also not sure why you think that a" couple hundred pounds of lead from the keel was replaced with West System". That is not good news. What makes you think that happened?

Regards
Jeff