The test for wood cored decks I use is to walk the whole deck
. It should feel hard like walking on a sidewalk. Any springiness creaking or crackling are bad news.
We ressurected a hurricane
damaged boat that was totalled and auctioned on ebay. I've never even considered resale value. The only relevant value to me was getting something I could afford and get out there. The prices listed and survey
values are false values to me. We've replaced every pump, piece of electronics
fitting, line on our boat that worked fine when we bought the boat. Unless its fresh with a warranty I wouldn't include it in the boats value and would consider it on the verge of failure. If you buy a boat at a deal and install these failure prone items yourself with warranty iMHO you will be better off. Consider the hatches. The gaskets are old hardened and need to be refreshed. Another boat same model may not leak NOW but will start sprouting leak after leak as the years go by. If you refresh the gaskets you have the full lifetime of the gaskets without having to deal with leaks
developing one by one. The diesel
tune up you mentioned. You should do all to an unknown motor
that you'll do to it. Filters, fluids, pump service
, anodes, rubber inspection
,starter and alternator
bench test and inspection
. If you spent the extra 5k for a boat that has been in service
you may find out you've replaced and fixed everything that was wrong with the other within a year.