Since I'm using desktops, I'm just going to slap on little rubber feet and stack them without a rack. I contemplated doing exactly what you suggested with the rack, but I decided against it just to help ease assembly/disassembly for maintenance. As far as capacity, it can contain 4.25 gallons of coolant with 4" of room to spare at the top of the res. It takes a little while for the water temps to change depending on use, and for a multi-PC cooling loop, that is very important to me.
As far as a fanless mount of this radiator, you could probably get away with it, though I would personally want at least a Panaflo M on 5V blowing over it (you can't hear it at all at over a foot ... outside of the range of hearing) just for safety. If you run it fanless you'll be a little warmer than a BIX running with push/pull fans (in my experience with it), as long as you have over 1.5 GPH flow through your system.
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#!/bin/sh {who;} {last;} {pause;} {grep;} {touch;} {unzip;} mount /dev/girl -t {wet;} {fsck;} {fsck;} {fsck;} {fsck;} echo yes yes yes {yes;} umount {/dev/girl;zip;} rm -rf {wet.spot;} {sleep;} finger: permission denied
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