I don't use multi beast, add everything manually for full control.
-> installed lion from appstore
-> chameleon installed (currently rev 1996)
-> smbios.plist iMac12,2
-> DSDT.aml + SSDT.aml
-> FakeSMC.kext, ALC8xxHDA.kext for Realtek ALC892
That's it, a 100% working mac with as few additions...