I have a 2004 43 DS...so not sure how pertinent the response is... take good look at
keel, bolts, etc.
Keel will be iron if made in
France. DS plexiglass
salon windows tend to craze, mainly cosmetic...a
boat that old likely has a lot of aftermarket upgrades and changes by now, so a lot depends on what it has for options. The standard items are of course very important regardless of the make/model such as standing
rigging and
engine. A lot of older boats have had owners do their own
electrical work which can be troublesome and a typical
surveyor does not survey the
electrical system for ABYC compliance, if at all. Not sure of the 40, but my 43 still has the integrated stringers which provide excellent stiffness. Never hear a creek or groan beating hard to
wind. Best of luck.