I'm in a similar position and this has been a useful read so thank you!
I'm trying, so far unsuccessfully, to install via the iboot (chameleon, stolen and rebranded) + SL method on my D630 (2GB RAM, NvidiaQuadra 135m). As my bootloader is spinning up I get an EBIOS error although the boot does complete to the bootloader section. Then when I insert SL disc it fails to recognise the disc and generates a ton (well about 10nr) EBIOS errors and eventually it tries to load windows up by default.
I don't have access to a Mac so I'm sort of stuck. I'll try and disable the wireless in the BIOS and give it another go tonight although i was pretty sure it was Broadcom. Video is Quadra 135m which I think is supported.
Any other ideas? I'm a newb so things like kext strings are confusng to me! Any and all help/comments appreciated!