1)I would setup the rad with the air coming from the outside of the case a exausting inside the case. There isn't going to be enough of an increase in the temp of the air to worry about it adding heat to the inside of the case.
From what I'm reading in your post the only other fan is in the power supply? If you duct it to the power supply fan you won't have any air movement for the rest of the case.
2) I don't have an Eliem pump, but I would use epoxy to hold the PVC on. (Question for Eliem owners, don't Eliems have threaded fitting? Can you unscrew the hose barbs?)
3)I've seen post all over the place saying old mouse pad's work well for this.
4)It will only montor one Cpu. But you could use two of them, one for each CPU.
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