You can also use drop-down doors with three hinges at the bottom and three latches at the top. You can see some photos of what I'm talking about here.
Constrictors Northwest
I've been using these enclosures (in black) for about four years and really like them. The doors are secure provided close them; (don't ask me how I know that), and his prices include shipping. It took me about 30-45 minutes to assemble each cage which included adding some more ventilation holes and adding fluorescent lighting. Just another option to consider...
Threaded Mode