I literally also did this two weeks ago, I repurposed an ASUS PN50 as a router. Luckily, I didn't have that much trouble and wound up refreshing my network chops a bit (using tcpdump to diagnose a dhcp server that wasn't doing what it was supposed to)... I'm considering releasing a video tut on it. My only complaint is that I think (could be wrong) download bandwidth is limited by the "upload bandwidth" on the ASUS' wifi adapter, since it's running in reverse.