First time poster (I think. )
I have a similar build working, did the guide. Issues I ran into.
1. Plugged USB Stick into USB 3.0 Slot. USB Stick had to be in the first slot or two, else I would get a "Waiting On root"
2. Installed Mountain Lion, but did like to reboot, launched it in safe mode, installed multi beast.
3. On reboot, I got a white screen. I rebooted a few times, finally in safe mode then it worked ok.
4. Installed the nvidia drivers, and put the card in on reboot. Everything started working better.
5. After that, I put the fakesmc.
I think its running fine right now. Its zippy as hell. All the parts are from the March 2013 Guide for CustomMAc Mini Deluxe .
Thanks for posting guides everyone.