Gurruwiwi, I've installed Leopard ( I prefer to wait with SL till I can convert one of my other pc's to leopard too as I need a spare to install SL.

With Leopard it is working fine! Got full QE/CI, audio works, wifi works ( with the 1490 ).
But I still got a problem with the SD kext I think it is. Could be because I used kext helper instead of OSXtools But I had to reinstall, now made a copy with carbon copy onto my external drive Neec to try tonight if it works with osxtools as I've found them now ( osx86tools ).

Keep you posted

But I have another question too.
I'm on a dutch macOSX forum too, Is it alright if I put your guide there and in my own language ( Dutch ). I'll post credits to your post