We have a 1976 Hunter 30. I am plodding away at the repairs. The forward Hatch looks like its been through a war or two. I am curious if anyone knows if it may be an original hatch. It is made out of teak, the corners are screwed together but not with woods screws interestingly enough. Its seems that they must have put threaded inserts in the side rails before the put the frame together. Its is screwed fron to back, and back to fron into the side rails with machine screws. It is trapezoidal. The front is 25 1/2" port to starboard, 29" front to back, and 28 3/4" port to starboard on the rear side. The glass (plexi) was held in with screws, bedding material, and finishing washers. The screws holes were drilled at an angle, equal to the slant of the frame. The measurements above may not be exact, simply because of wear. There is a crown in the roof of the boat and the hatch cover is milled to fit the crown. It looks like the crown (in the center)is about 1 1/4" higher than the sides. I know JC II was looking for an original but I am not sure for what boat. I have looked all over the place for something that is similar in size, and won't require a second mortgage. If I cant find a reasonable replacment I think I am just going to fill all the holes, resin the whole thing, glass the corners, gel coat it and put in a new piece of glass (lexan). I am usually up for a challenge, but reproducing this hatch would take an awful lot of time to cut all the angles and crowns. I think it would have to be done by hand, maybe with a spoke shaver, and my to-do list is a mile long already..