THANKS @djouija for the awesome work! just follow post #4
Looks like today I'm lucky..
I just booted and I'm using osX 10.9 on my M6400: fine tuning now..
First of all I used MyHack solution 3.3 + the mbr patch for mavericks (still unsopported in myhack while writing)
I also put in extra my DSDT from a previous 10.6.8 osx install
booted with graphicenablers=no and good old npci=0×2000 (truth is i modified org.chaemeleon.boot.plist with chameleon wizard and also set graphics mode to 1920x1200x32)
I had to remove all NVDA kext from extesions folder to make it bot as was hanging on a black screen suddenly.
I installed and the pc booted completely..
now I'm tryin' to fix other stuff
Checking now but almost everything to just use it
keyboard and touchpad (out of the box thanks to myHack)
WiFi (but I have a Atheros board that worked out-of-the-box)
audio (just used old Applehda and hdaenabler for IDT audio from SL)
Full Graphic Acceleration (kinda SOLVED using Maverick DP8 drivers found here)
bluetooth (kext used for snow leopard)
Audio (I'll try with patched Applehda and hdaenabler for IDT audio) full Graphic Acceleration (I dont know why.. the system detect it correctly both using DSDT or graphic enabler and everithing looks like is there but there are glitches in chess and topbar is not translucent)
I'll make this first post better when I'll have more results