After the initial installation of ML, before any multibeast stuff was installed, the graphics were working perfectly and networking was working perfectly.
I never installed the AppleIntelCPUPowermanagement kext. ML does shut down properly at least, which Lion never did. I had to hold the power button down to turn it off.
In any case the key turned out to be not installing the FakeSMC for nVidia (you do still need the main FakeSMC).
I did wind up needing to install the AppleIntel networking kext, as something I installed knocked out what was working after the initial install. I may go back and try to figure out what did. So I can get back to using the "native" drivers.