Well, my Bandit 17 has a 2-section wood door made by the previous owner; it's painted white to match the cabin color. The two-piece door works well and lets me lock the cabin up. Anyway, I can send pictures, dimensions, etc. of the door or hatch if you give me another email address; I can't get pictures to attach through this forum.
Also, you don't have to have your boat worked on by a marina; they're always extra-expensive. Any decent woodworker can made a nice cabin door for you for less money. You may want to have a wood hatch cover made, also; it's bound to be less expensive than molding a fiberglass one.