Paul,
The only thing that would worry me about your boat is the water in and around the rudder. That is a relatively high stress area. I had a J24 with some water in the core of a rudder that almost broke! I think you can still buy a new J30 rudder for less than $1,000 from TPI.
The deck around the chainplates and the bow pulpit are not high load areas, and, believe it or not, neither is the bulkhead. The chainplates are bolted in a region of solid 3/4" - 1" fiberglass; then there are triangular sections down and out from the chainplates of 3/8" glass heavily tabbed to the hull. The bulkhead is very lightly tabbed to the deck outboard of the chainplates on the foreward side (this connnects a 1/4" sheet of plywood on the foreward side of the bulkhead to the deck and I cannot see what this acomplishes). Otherwise there is no connection between the bulkhead and the deck. The rest of the bulkhead is little more than two sheets of 1/4" plywood with 1" of balsa sadwiched between. I think it's little more than a wall. Mine was soaked soon after I bought the boat after a two day soaking rain and a leaking chainplate. However, it dried fairly rapidly after the leak was sealed.
I have a lot of water in the deck around my chainplates. I know because I just finished drilling a few hundred holes into it. However, the vast majority of the core is in excellent shape, just needing to be dried. I honestly don't think I'd have known about the water had I not started dealing with small (3" - 4") areas of rot around the chainplates.
The deck on my J24 had all of the hardwear set in solid epoxy. Essentially sealing off the balsa core from the environment in a more permamnent fashion than 3M 5200. We are starting that job with the chainplates and bow pulpit this winter. We plan to do the handrails and genoa and jib tracks this summer.
Good luck with your new (old) boat!
Mark
