Nauticat 40/43

[Lantau]

Can anyone with experience owning a Nauticat tell me what to look for in a mid-1980s Nauticat 40 or 43 (as far as I can tell, the only real difference between these boats is three feet). What bits of these boats need to be overhauled or repaired after almost three decades, assuming the boat has had good continuous maintenance? What bits are known to fail for lack of maintenance or even with normal maintenance? Importantly, what should one look for when doing an inspection, apart from the usual stuff, and what might a surveyor miss?

Thanks in advance.

(P.S. I posted this as a reply in another forum without much response. Apologies if you've seen it before.)