Pics as promised:
This is what it looked like before:
Because of the 3 slot Artic Cooler had to move the PSU to the top, and put the top fan to suck air through the 5" drive bays. Also changed the PSU for a 1000W, rather be safe than sorry.
And to help the airflow through the bottom fan I cut out a few of the horizontal bars.
Not pretty, but does the job. Should be good for 18K PPD in F@H and 4-5K PPD in WCG.
The Noctua is amazing btw! 7C Cooler than the Megahalems even though I have one more GTX 275 in there now.