Hello, Christy!
You can choose from our great selection of different plastic materials for this custom item. We have lucite, polycarbonate, plexiglass, acrylic and virgin cast acrylic (also known as museum quality acrylic). All of these materials come with benefits and drawbacks, but generally are ideal for outdoor use. For locking mechanism you can choose between a camlock or a hasp lock that you can use your own locks for or one of ours.
For any more information, you can contact us again. Although it would be greatly appreciated if sent a picture or a drawing of your desired custom project.
Thank you!