I'm sure it's possible, but I wouldn't want to risk them overheating. Modding 120MM deltas on top of them is probably the best way to go.
Definitively do it this way.
Even my Platinum server PSU heat up with their ear-rape fan at full blast. Modding them to use big fans would make then cooler and much more quiet.
What platinum server PSU are you referring to? LOL at ear rape fan.
These;
http://www.digikey.com/product-detail/en/PFE1100-12-054RA/PFE1100-12-054RA-ND/3535541
Got mine from Quakefiend, they're pretty small/thin so modding them would be a pain. So to save my ear, i just put 50% load on them. At 70%+ its like a car that need to replace its breaks. The noise become ultra high pitch.
At 50% load they're better than S5 fans at 2600 RPM