I've got my instructions here. Use at your own risk.
All that's not here is how to use the stock wifi card and how to get audio to work. I figure if you are here, you probably know that. I'll post those instructions some time soon.
All you need to do this is an original apple install disk of the 10.5.x flavor, I used 10.5.4, There may be an issue with DVD's from before 10.3, not sure there. I have not tested them as I don't own one. You also need to download a 15 mb boot iso.
I'm now running 10.5.6 will everything working but:
Microphone or audio in
It needs to wake on sleep with the power button. (my last install let me wake with any key, but I can't figure out what I did to make that happen. )
Weirdly it does not give me a shudown/sleep menu when I press the power button. No idea why.
Check it out, give me tips.
lots of thanks to everyone who have gone before me Especially eNik (http://www.enik.ch/) who's install site rocks, and the creators of the 132 boot loader and Chameleon.