I get the following whenever I try to install the ALC892 kext:
There is no '/Extra/modules/HDAEnabler.dylib', '/Extra/DSDT.aml', or '/Extra/SSDT.aml' file on the target volume. Either place one there, select 'Bootloaders > Chimera v3.0.1', or if you are using an EFI installed bootloader check 'Drivers > Audio > Realtek ALCxxx > Optional EFI Installed Bootloader Support' to continue.
It says to install the EFI Installed Bootloader Support option, but when I do that, and reboot, I get a kernel backtrace error which has something to do with "AppleIntelCPUPowerManagement". Out of curiosity I tried adding a pre-made DSDT for my (DH67BL) motherboard into the /Extra/ folder, but that yielded the exact same results, but that could very well be due to a bad DSDT, too.
Since I can reboot as is (before I install any kexts), it seems to me that the problem is with the ALC892 drivers. I find it odd since before (Like, 10.9.2-ish), I was able to install OS X, run MultiBeast, install the ALC892 kexts, and everything would be fine.
EDIT: I got the same results when simply adding the boot.plist file. It seems as if just adding that causes the problem.
I still have no idea why UniBeast didn't create an /Extra/ folder or anything within.