No fan on the backside, and if you look closely, the general airflow is bottom to top.Oh man is that ever sweet!!!!!!!!
A boutique builder would be proud to send such a clean looking install to a mag like Maximum PC for review.
The only question I have is on the orientation of your northbridge cooler.... Looks like it's passive, and if so, wouldn't you get better airflow through it by turning it 90 deg? Looks like there would be enough room.