Hey there my Supra buddies.
Okay, here's the thing to know about wood floors: almost EVERY boat is wood! My boat now is a 1976 and the wood is as rock solid now as it was 20 years ago. As long as you can find one in good condition you'll never have a worry and your wallet will thank you.
There is NO reason to be that paranoid about the wood. They don't just turn to junk in 10 - 15 years by themselves, they have to be mistreated.
The trick is to use some clues about the history to establish the condition of the floors.
-Has it been kept on a lift/trailer? Stored inside?
-Has anything been replaced?
-Is anything faded (sun exposure is evidence they didn't cover it and it could get rain) or ripped in the interior?
-How many owners has it had, do they live on a lake (use it a ton) or trailer (use it less)?
-What did they use it for?
-How many hours are on the engine and has it needed to be rebuilt at all?
-Finally ask the owner if any portion of the floor is soft or has been replaced, and then use a sharp screwdriver and tap it with a hammer gently on the floor to see if it is hard or if it sinks in. Then check the motor mounts at the stringers. Bring a socket set.
As long as the basic care and winterization has been done, and as long as it has been covered, you are going to have a boat that will live 30 years or more.
I'm bringing home my first inboard, a 1987 Supra SunSport this weekend.
Good luck!