that is a very nice looking rad and the single pass mod will = much less flow restriction for sure.
I think it would fit in the case I am currently modding as well:

^For size reference, the beige object in the lower left corner of the pic is a standard four 5.25" bay mid tower. The silver enclosure sitting on top of the cabinet is the PSU. It's amazing what you can find if you go digging through small town computer stores...
Anyway, how much standoff does the housing on that one place between the fins and the fans? Is it still around 10mm (based on the BIX I have on hand) or have they increased it? We have been batting the idea of a shroud for that one and another for the 120.3 back and forth but it is definitely on the back burner at the moment. hmmm...Does that one still have a 360mm core with 133mm overall width? A shroud divided into 3 chambers with 45mm of standoff would be interesting.