I want to thank JBraddock, for his contribution as well..
I'm happy to report that I also created a smooth Mountain Lion (10.8.2) installation on my HDX 16 (9600GT M 1050ev model but will work on other models as well)
For my installation i used Chameleon version
v2.1 r2070
Everything works except the intel 5100 WIFI card which I knew beforehand not to bother with (but I have a really cheap compatible Atheros HP card on order) so for now I'm using a Ralink usb WIFI stick. Also as said before touchpad functionality is a bit limited to generic use but then again I use a mouse, I care not.
More specifically:
Audio is fine, (The top control touch slider works fine) All flash content and no crashes or crackles with only a small one when shutting down...you'll have to use these Kexts I found, put them in System\Library\Extensions.
Backup first and then delete AppleHDA.kext first otherwise you'll get an immediate kernel panic:
IDT 92HD71B7hdx16Audio.zip 255.55K 78 downloads
In extra\extensions I used this collection of kexts (including the keyboard and touchpad ones and plugins for hardware monitoring
ExtraExt.zip 933.7K 59 downloads
For 2 Power States (I haven't bothered that much with that yet) use that SSDT in Extra:
SSDT.aml.zip 575bytes 38 downloads
This is my chameleon bootconfig file in Extra:
org.chameleon.Boot.plist.zip 541bytes 48 downloads
This the HWMonitor App I use (Thanks to the team developing this amazing utility) that's compatible with these plugins. You can set the application to start at login if you wish
HWMonitor.zip 315.23K 44 downloads
Thats' the DSDT I use, it contains nvidia GT 9600GT changes so that you won't get a black screen at boot:
dsdt.aml.zip 13.25K 52 downloads
That's the absolutely essential kext you'll need (System\Library\Extensions) so that you'll be to able to boot normally and not get and endless spinning wheel and Apple Logo at bootime or kernel panic at verbose mode backup the original one delete it and then install this one using kext utility or just copy it and repair permissions:
AppleACPIPlatform.kext.zip 1.62MB 46 downloads
Ok that's what you'll need..I had some other issues due to getting a new Scorpio Blue disk 500Gb with 4k sectors so there was some minimal terminal work to be done to have chameleon boot properly (Let me know if you need help with that)...Other than that I used a ready made Image of mountain lion which i restored from another Mac using superduper...
Cheers!
P.S: One more thing I had some issues with all my memory being properly recognized and weird auto sleep issue just before login...So I used an old windows installation on that laptop from another disk to update the bios and everything worked.