Show us what you're looking at. Are they plexiglass portlights? Plexiglass, Lexan, polycarbonate, acrylic, are all very easy to work with if you have a table saw, a jig saw and a belt sander. Easy to cut shape drill. If they are all the same size, you're talking about scrap plastic and a couple of hours to fab. Post some pics then await the onslaught of opinions. Mine will be specifically from the trailer-sailor DIY point of view. My companionway hatch boards are made of grey polycarbonate adhered together with "living hinges". To prevent folks from seeing my Mrs changing, I sanded the inside with an orbital sander. Worked mint!