I didn't even think of that in my first post - I'm usually a supporter of inline pumps (and no rez - I think they just provide more places to leak and more liquid to leak out of them when they do) - but in the case of a modular system like this you will need a rez (every time you plug in a new computer to the system, the tubing/blocks inside that system will be filled out of the rez), and just to keep the pump quiter and locating it easier, I'd go with a submersed pump.
I'd probably run a large diameter tube down one side of the rack (like Airspirit did), and put on a reducer type thing at the bottom so that most of the pipe would be say 3" or 4", and the very bottom 6" to a foot would be wider, say 8". The thick section at the bottom would house the pump, with the pump outlet connected to a 1" tube that would come out the side of the thick part and run back up to the top with points down the side of it to connect computers to.
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