Another confirmed customer with phelics12's KEXTs and clover configuration files, thumbs up for the pioneers who have done the legwork for all of us.
What I have did differently from phelics12's instructions is,
1) I installed Clover version 1050 on a USB 3.0 drive. Move the phelics12's EFI configurations files to replace the ones on the drive.
2) Turn off CSM in BIOS Setup. Test booting OS X from Clover USB drive.
3) Once there is success in booting, I transferred the files from Clover USB drive to the EFI partition on my internal SSD.
4) Enter the boot entry \EFI\BOOT\BOOT64X.efi for the EFI partition. Remove Clover USB drive.
5) Reboot. Voila!
So I did not have to reformat or do any extra hard work. On my SSD, the GPT partition goes like this,
1st partition - 120 MB Clover EFI bootloader
2nd partition - 250MB GRUB EFI bootloader
3rd partition - 10GB Ubuntu Root
4th partition - 10GB Ubuntu Home
5th partition - 60GB Mac OS X Mountain Lion 10.8.2
My comments, OS X boots blinding fast. My jaws dropped, I just could not comprehend the speed of the thing. It's a whole multitude new league in comparison to a retina MacBookPro. Apple logo screen lasts one second. Sound works alright. Screen is nice and bright. I will be placing Mac apps on external USB 3.0 drives to test the long term reliability of the USB Kext.
My gratitude to all of you. BTW, my Mac's spec is as follows,
Upgraded to 10GB RAM and Plextor M5P 128GB SSD.