Update:
I have now managed to boot into the os using Chameleon on usb with AppleNForceATA.kext added. My graphics card, on board lan and audio don't seem to work. The graphics card is a Nvidia 8800 GTS 320 mb (Evga).

I have tried Graphics Enabler in the boot plist file and EFI strings but neither of them worked. System profiler does show the vendor being NVIDIA, but VRAM is only 32MB and I'm limited to 800 x 600 resolution.

Any help with the graphics, lan or audio would be appreciated, thanks!