I posted some new pictures of my Super-Duct
As I said, it's made out of a Nissan distributor cap cover, and held on to the case with one small bracket screwed into the case. It is not attached to the PSU, but is held against it by the bracket and a foam seal. You can remove it quickly with three screws.
The Alpha heatsink under it is not visable, but it has no fan on it, cooled only by the Fortron 120mm fan. The two 60mm fans you can see only turn on when the temps approach 50c. I have only got these fans to turn on running CPUBurn. So the setup usually is very quiet.
All the intake air is coming through the one filter you can see under the hard drive. The drive temp is usually under 38c.
I applied a few new stealth techniques to the power cables.....you can see them in the photo with the hard drive. Basically I routed the cables behind the insulation panel. There's two connectors sticking out for further expansion.
I'm still working on this new setup...more pics to come.