Badfishtoo,
We are in the process of building a temporary hatch for our N28-II. I am building the temporary hatch so that it is fully functional as it is likely to be on the boat for several months as I work on the original one. Ours is fiberglass that used to have what appeared to be a plywood insert on the top. I finished pealing the plywood layers off a while ago, and it definitely needs attention. I will be adding another layer of glass cloth and mat, then building up the top surface with teak decking slats. Here is what ours looked like after removing the plywood.