Thanks Larry! I know how you feel about Great Harbours!
And Jim, as far as dinghy mounting, the owner of Shalala had his dinghy repositioned like that well after the boat was built. There is one other N47 like this and one or two N37s set up this way (picture 1). I don't like the dink in that position, personally. I think it cantilevers WAY too far off the aft end. If you look at the second picture, you can see the port flybridge settee before the cushions were installed. So, it's pretty obvious that if you wanted to relocate the whole dinghy farther forward, you would have to do some 'glass work. The "standard" mounting of the dink is at an angle across the aft section of the hardtop, behind the seating. The drawback to the standard position - and the reason some of these boats were changed is that the 30hp outboard on the 12' Caribe extends about a foot out beyond of the hardtop on the port side. This can interfere with locking through if you are tied up to the lock wall on that side (of course, in that case, I just hip tow the dink anyway!) Another option would be to only mount an 11' dinghy with 20 horse engine. This would not extend beyond the hardtop at all.
Finally, Donsan, the major differences between the early boats and later boats would be the size of the props (later boats have the large 24" diameter props), size of the motors - some early boats came with 3-cylinder, 39hp 3JH3 Yanmars and others came with 4-cylinder 56 hp 4JH3s while a few of the much later boats had the lower rpm 54hp 4JH4s, SS rails vs. tigged aluminum, oil-rubbed interior mahogany versus polyurethane, side-opening portlights versus the later stainless lift up portlights with drip spouts, and other cosmetic differences. Also, most of the later boats had the excellent ZF-Mathers electronic controls and some had a molded fiberglass saloon sole (with teak/holly over it) versus a 2x4 and plywood sole (again, with teak/holly.) But to answer your question directly, there are no inherent issues at all with a well-maintained GH of ANY vintage.