^^Agreed. Anythings possible, , but how far ($$$) you're willing to go is another thing. Definitely need a cooltube, the water-cooled one sounds interesting to me. Maybe you can mount it so that it's not actually inside the rubbermaid, just mounted on top and shining through a hole cut to size.

Get a nice big fan (preferably with a speed controller) + cooltube and I'd say you have a shot. Worst thing that could happen is that you spend another $60 to build a real grow tent.