Use SaCleo's method.... you will need to copy your DSDT.aml over, and use EFIstudio to generate an EFI string modified apple.com.boot.plist file to give you graphics. I use DSDT for my ALC888 sound as well (with LegacyHDA kext) as well as modifying my HPET so I can boot AppleIntelCPUPower Kext, without any Disabler. Other than that, you will need Netkas' modified AppleIntelPIIXATA to boot, and make sure to use Kext Utility to repair all permissions and rebuild extensions.mkext after any and all changes.... I think that's in the aforementioned guide though.