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.