actually, you could have a pretty large fan in the JP, so you could have a much larger volume of fresh air coming up to the bucket, which would produce more air movement than the small cpu fans that just fit inside the bucket. you wouldn't necessarily have to use dry ice or anything to cool the air, just the larger amount of air moving around should greatly increase cooling. I suppose one problem with moving a large volume of air around would be that it would make hearing more difficult though. The one line in aand one line out, or "intake & exhaust" idea sounds really interesting too, this really sounds like a project worth looking into or pursiung!!