Not too complicated really. Danger Den has some kickass 6800 waterblocks, so I'd put two of those on first. Running these two waterblocks in series wouldn't be too bad as the temp would average out eventually anyway. But if it mattered, I'd put the freshly cooled water into the "fast" card (x16) first, then jump it over to the "slow" one (x8). Just put a piece of tube jumping the exit of the first block to the second block's inlet.
The rest is like a standard watercooling set up with a pump and radiator. Res is always optional. But a small pump could really be used on an SLI only cooling loop.
Yeah that's wht I was thinking Chumly but the nozzle thingies in the danger den waterblocks (the nv6 series ones) poitn up. So how do you dela with that? They would have to go up and bend around and back down so there's no fold in it. But I guess you could use right and tube dealies. But I don't like those but I guess I'll have too. Or just use a normal water block but that's cheating.