Several people have mentioned corrosion....
That's what would turn your airframe into an expensive mistake, and my two-penn'orth is get some-one who knows what to look for to go over every inch. In my experience incipient corrosion is very hard to spot until it's got beyond redemption, unless you're used to it.
It's age not hours, and the less use the more likely the corrosion will be, unless it's been kept somewhere like Arizona.