EDIT: Got past the error by taking out the npci=0x2000 string and choosing BuiltInEthernet=No in the boot.plist.
I followed your guide to the minute but get stuck at devfs_kernal_mount : failed to find directory / (please see attached pic) during the install process.
I've googled the above but couldn't find any useful info at all.
Worth mentioning is that I'm using 10.8.2 as my boot source and not 10.8.0.
Also, Hacked 0326 Bios with ACHI selected and 2 GB of RAM (which seems right for the supplied DSDT)
If you, or anyone else got a clue what might cause this please chime in.
Thanks in advance,
check your USB stick. 1201 is a little tricky in terms of booting from USB. I've have many tries until I got pass "Still waiting for root device". If you're having problems with root device, restart the pc and change your USB stick to another port and try again. If does not work after a few tries, built another bootable usb stick
A good way to check if usb stick is booting good, is to have an eye on led activity and try to identify if USB is reading correctly or not.
Regarding to black screen. are you using PCIRootUID=0 ?I've had that on first boot with usb.