If I were to build a watercooled rack, I'd take a full-size car rad from a smaller car, and lay it flat to form the top of the rack. Fans below it blowing up (yes, I know pushing isn't as good as pulling, but sometimes ya lose a bit of efficiency for design and stuff), and a KVM switch / network switch / etc. thats not very deep mounted at the top of the rack. The fans for the rad would be behind the switch, so effectively using up 0U of space. The racks I deal with are all 42U racks though - so we never put stuff on top of them (you can't see on top of them, we'd lose stuff up there), which is also why I'd more likely put the fans below the rad. And you can mount the rad with either both barbs at the back, or both on one side depending on whether you want to run all your "mains" level tubing (the stuff that branches to each server) down one side, or the cool on one side and the hot on the other side.
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