I have swinging doors on removable hinges which swing outward. Just inside are removable swinging screen doors that swing inward. Both can be mounted at the same time and used at will. Outside of the swinging doors are slots for drop boards made from G10. These are installed when leaving the boat for storage (for security and to keep the sun off of the swinging door varnish) or theoretically in very heavy weather. The lowest drop board can be replaced by a step that forms a bridge deck. It has all worked better that any other boat I've seen. No windows but if there were I'd use a UV resistant grade of surface hardened Makralon or similar.