Wow... that's a pretty slick rig. You should get a vented blank plate for the front so the fans can draw cool air right across the top of the Valvulator. That would also let the LEDs in the back be visible from the front.
The Valvulator only has that one tiny vent on the front, so i doubt fans in the back of the rack case are going to draw very much air through the Valvulator's enclosure. Is the VHT fan-cooled at all?
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