Easiest path is to have two blank hard drives to begin with...
Boot into a Live distro of Linux, I used Ubuntu 10.10 FYI, though that's not critically important
Then use dd in linux to copy the entire OS X DVD - I used 10.6.0
dd if=/dev/(your CD/DVD device) of=/dev/(device name of one of your blank hard drives)
eg dd if=/dev/sdc of=/dev/sdb
Use fdisk -l to check the device names or something like disk utility or gparted
Once you've got the DVD duplicated to one hard drive you can navigate to the relevant kexts and either remove or modify the contents using nautilus - "gksu nautilus" will get the window manger running under root privileges
Remove IOATAFamily.kext if booting from a duplicate of anything lower than 10.6.3
Edit the info.plist inside the AppleAHCIPORT.kext, there is a device id 2681 in the second set of devices, change it to 2682 and save.
I can't give you a step by step as I hosed my install at least half a dozen times and had to recover it with various means
Using ###### or another Chameleon boot disk (CD) to start booting from the hard drive installer.
Once the system in installed, you will have to remove the IOATAFamily.kext from the installed system, otherwise it won't boot correctly.
Updating to 10.6.8 was as simple as downloading the combo Update and running.