EDIT: Now i'm sure that is a waste of time to use Lion 10.7.4 XNU kernel as is to boot Mountain Lion, since it requires ssse3 instructions to boot 64-bit, and Mountain Lion requires a 64-bit kernel. We could just try to solve this problem with the ssse3 routine (it would help Lion AMD users too), but even with this, maybe it cannot boot Mountain Lion anyway because of core changes in the new OS (even the changes being not so drastic from an end-user point of view).

So i think there's two main paths for AMD hackintoshing by now: 1) focus on Mountain Lion XNU itself, and before even trying to patch it for AMD, we must discover if it has any ssse3 routines required to run, which ones, and how to change it and then apply patches AMD-specific (unless we plan to abandon non-Buldozer users like me, lol) or 2) focus on Lion 10.7.4 XNU, since we have a patched one for AMD, then making it run 64-bit flawlessly on AMD with Lion itself, by correcting the ssse3 calls in the commpage and bcopy.s routine and perfecting the AMD patches (remember that even Bulldozer ssse3-enabled CPUs have to boot arch=i386, which won't work with ML), and only then try to either have ML booting with it or generate a diff file from it by comparing it with ML's, and then apply this diff with AMD patches and ssse3 correction as a patch to ML XNU (I tried something like that though, applying RAW's diff directly as a patch on 12.0 XNU, and got an epic fail).