DStar, Iwent through the same process with my boat after I got her. I sailed her from where i picked her up to her new home (25 miles) in 15 knot winds. During the sail I noticed a lot of slack in the shrouds and sway in the mast.
I new the boat had water intrusion, just not how bad. My chain plates had leaked into the deck core, through to the bulkheads that where partly enclosed in glass (they turned out to be dust) and through to every thing else.
As it turned out I gutted the entire inside of the boat. Taking each piece out carfully and usind it as a template to make a new one.
It is a big job, did it over the winter months. There are a number of good sites out there i=on the net with fairly detailed instructions from people that have done this on their own. One is a triton site and you can also find info on the west system web page. I just typed in "repairing leaky chainplates" into my search bar and found loads of step by step info.
Good luck on your project.