Are you sure?
That is one tough undertaking. Do you know that you can just buy pieces/parts?Pretty sure that your portlights are the same as those on my H37C, just fewer of them. The small ones I call 5x12 and the large ones 7x14. But you will want to measure. The measurements are to the outside edge of the spigot(the frame not the trim ring, see picture) in each direction. The spigot size is the size of the hole. Then call Thrifty Mariner with those numbers, he'll know exactly what you need. And he can tell you about pieces/parts. You can also check the Related Link below.