2) Reduce the power requirements on the computer as much as possible.
Without changing the hardware this basically means move stuff from your
10TB of local disks to the NAS.

The local RAID is required for uncompressed HD video editing.

You want the air to have to travel in a zigzag pattern so that there is no
direct
path for sound to escape.

I was thinking along the same lines, but check out the 3D Model Tour at
http://www.kellsystems.com/3d.asp#tab9

It appears the air intake is at the bottom back of the unit, and the air
exhausts are a relatively simple modular package at attach to the back of
the unit. Each exhaust module has three fans at an angle that force the air
down and out through side ports. Is that how you imterpret this model? In
other words, all of the Kell air flow is at the back from bottom to top.
They make no attempt to force air to the front of the rack, so each rack
unit is responsible for pulling air into the front and out the back, and
then the air exchange happens at the back where the Kell vertical air flow
exchanges with the rack unit exhaust. Is that the way you see it?

Best,
Christopher

PS: Pause the video as necessary to examine the exhausts.