I tried to go that small, the fact is it's just not workable or possible. For me, the magic size was (2) 6U Rackbrutes, which I've since modded with intellijel tps80's, ventilation. PM-DB25 connections, USB port for Flux, and so on. The 89hp per row just works for layout and module sizes, and the 76mm depth meant that I could run whatever I needed or wanted.
-- Vow3ll

Hey Vow3ll...i would be really interested in the mods you did to your Rackbrute 6Us. I have a 6U and a 3U currently filled up and will be buying another 6U soon to run 6Us side by side...with the 3U complimentary to my Minibrute 2

JB