where to put the 'fuge.....

[Flusher]

That's an awesome set-up in the link. The only thing I would do differently is put the 'fuge in a separate tank over the display. Add a small water supply line to it, and have it drain back into the display. This would let live pods, etc, drain into the display without forcing them through a water pump impeller, then through a pressurized water supply line.

I'm not a big fan of combining sumps and refugiums. Sumps need a faster flow, unless you plan to jam a bunch of powerheads in the tank, or make a closed loop. That's just my two cents.
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