Consider plastic
I replaced weather-worn companionway door on a 24' Cal I used to own with a light grey plexiglass type material. I got it at a store in Portland called Tap Plastics which may be a franchise. It lightened up the cabin, cuts and drills like wood, and you don't have to oil or varnish it. If you like the looks of wood or want more privacy than a semi-transparent plexiglass offers, get a piece of marine grade plywood and oil or varnish it. It will be much cheaper than new teak anything.