My 1984 nacra 5.0 has no inspection ports, pretty sure it is solid glass based on the thud the hull gives and if I push the side the hull will flex a little. I looked at a 1984 5.7 with inspection ports which was solid fiberglass with stringers. An inspection port would be nice, but I think I would only put one in if I really needed it. Just go look at it and look closely where all fittings are attached to the hulls.
That's good advice. Just look for any cracking gel coat (some will be normal - a lot will indicate a structural problem). If the hulls are not full of obvious sags and dents, then the boat is probably pretty solid.
