yeah, I cut up my stock xfx 7800gt cooler to fit my nf4 chipset. It was a little difficut to drill the holes, but if you have a drill press, it won't be too difficult.
It was a little shallower than the stock cooler, so i ended up with more room. Without any airflow, it is cooler than the stock, and with a 80mm fan in the drive cage, it is over 20 degrees cooler than stock.
However, i just bougt the new jing ting chipset cooler and I'm going to try that out.
Let us know how your mod goes and good luck.