any idea how effective it is yet? how thick is the tubing? (I've got an image in my head of huge 3/4 inch central heating copper pipes, but I'm assuming you have something a bit smaller!) Just a thought but if your building a case from scratch have you considered getting a car radiator and fitting that into the side of the case? I've heard stories of people using them to great effect. I assume that they can be run without fans I due to sheer size.
I break stuff.