Well guys, i am no expert, but after many attempts initially to get this setup going with many failed attempts all on this machine works. Initially the way i fixed my installation problems, which were similarly to yours where my machine would kernel panic at start up and/or go blank/black/white noise screen, were fixed by going with the 4.6 version of Multibeast for Lion, not the Mountain Lion version available at that time, i think it was 5.0.2 or 5.1.x. Anyway, if i have to run it down it would be like this:
Using that 4.6 version of Multibeast for Lion, install the following kexts:
Your system should at least be able to reboot after that. If it does, then you can try to run the rest of the kexts to get what ever you need to get working with the 5.0.2 version of Mountain Lion. Oh, and i use an SSD drive, so i did 3rd Party Sata, as well as Trim which i forgot to tick in those screenshots.
Also, what version of OSX are you using to do the installation? 10.8, 10.8.1, 10.8.2?
And finally, what version of BIOS do you have? My board had F8, so i downloaded the appropriate DSDT file from this website, i did not do ANY editing to it, just put the file on the desktop so the Installer could use it.
I really hope that helps.
Edit: I also have to say that i have not tried to do a fresh installation with the latest versions of Multibeast/Unibeast/ML OSX 10.8.2, i dont know if the same results would be produced. I am hoping to do another build to see how that goes with a new board. I would love to see the Admins of this forum do a run down of what would need a Kext update on a certain hardware and what wouldnt. For example, HD3000 graphics DO NOT need anything, that works right out of the box, but, a Realtek 8xxx audio controller does need a kext, at the very least do it with the boards that have been reviewed.