Obviously, a sealed duct air exchange system like in a Beetle is good for cooling. The plain shielding in a 1200 is not. If you converted it into a sealed wind tunnel and pulled cool air through it, sure, that'd work. However, you're better off just worrying about the chips that get hot and are likely to burn out and heatsink/fan them directly, the temperatures in a computer are nothing like the temperatures in a car's engine. The vents in the top of your 1200 do allow heat out.
