It is batter to select a box with small radiator with water cooling technology.
He's putting a PS3 in a box, now why the hell would he need water-cooling?
As for the actual project, how exactly are you going to run the fans and lights off USB power? Normal computer case fans run off 12V, whereas USB is only 5V. I'm not trying to be rude, I just want you to think through the electronics before you go piggybacking them off a PS3.