hey man i like the idea and i have made a box before but im just letting you know , no mater how much cash you throw at it and time and effort it will never be efficient. why the box? you probably wanted to be stealth (or else you should have gotten a tent) but if your having to do that heavy duty cooling on the 600W it is in no way stealth unless you have that fan quite as can be. also do you have a good supply of fresh air?