Well, I'm happy to say that everything has been working quite well so far - see below! So, now that the hardware has been installed, I can proceed to managing those cables a little. I first cut a quick piece out of 1/4" hardboard with a few strategic holes Already much more to my liking. Time to place the new fans with their new mounting system Ok - with both "plates" in place, I can cut the appropriate holes in the door and go ahead and install! Woohoo, that blue furnace filter sure looks out of place eh? Everything fits, it's nice, snug, and square, so I went ahead and added a bunch of closed cell foam Another view of the almost finished right-hand cabinet old i5 system *Testing* I've been using this cabinet setup for a little while now, and I'm happy to report that the temperatures are really quite nice. Because I've "sealed" the air intake portion, all of the intake air is coming through the blue furnace filter. You can literally feel suction if you place your hand in front of the filter. There is a massive amount of air coming out of the CPU hole, as well as the open PCI slots, power supply exhaust, and the half inch of space between the door and the "non-intake-area". (You can see in the previous photos, I did not put foam around the entire door perimeter). So far it has been idling at ambient (23-25) and at maximum, just under 50 degrees Celcius. I can hear the fans running - they are louder than all of the hard drives spinning up. I am going to get a small fan controller and get them down to the minimum speed while maintaining these current temperatures (There is a very large amount of air running through the case). *To Do* I have clearly got to find something to either replace the blue furnace filter, or cover it up with something a little more visually appealing. Also, I need something to cover the CPU exhaust area. It will need to match whatever I do for the furnace filter area. 'Til next time!