OCZ had a prototype case that did this exact experiment, it was going to retail for $300 and come with NO WARRANTY WHATSOEVER. The case was actually alluminum, was air tight, and they used mineral oil (much cheaper than flourinert) that was supercooled by 2 TECs and pumped around inside the case, the TECs were located on the top of the case where a watercooling system kept them at safe temperatures. I remember seeing a review on it where they got very good OCs on their mobo, video card, and CPU. I also remember them saying that it weighed over 200lbs filled.