What are the best materials for a public bathroom?

im thinking of a public bathroom which is near the seashore so its prone to rusting because of the sea breeze. it also needs lots of maintenance because a lot of people is going to use it. i have no idea what materials are best for making a public bathroom near the sea. do you know any sites that offer good ideas for a bathroom? sites that design bathroom for a beach resort or something. i was thinking of using plastic doors or something so it won't rust. the one i used were wooden doors and steel locks so now the doors are rotten, the locks doesn't lock anymore because of the rust. though there are lights, it's pretty dark and creepy at night. i want a well lit bathroom. please. any sites that has detail on constructing a bathroom would be very helpful.|||I would enjoy designing this bathroom for you. i have 4 years exp. in design and drafting. Let me know|||My husband sells this kind of stuff, and we love the equipment that is all hands free for public restrooms. There are millions of alternatives available, and I imagine you could use heavy duty plastic for doors %26amp; such.