I'm with you. I don't have the iAtkos version, but I do have Lion 10.7.3. And rlf's instructions were very clear and reasonable. And I did make the mods he suggested, but Lion would not restart afterwards. I have three partitions on my HD, so I was able to boot back into another Lion 10.7.3 version and put the old kexts back in.
Also I have a z68 Gigabyte board with an i5 and HD3000. My GPU Device ID is 112 and, like rlf said, that ID was not in the list with the others, so I changed one of the IDs to that one in each of the two files. I am sure rlf's advice was sound, but just don't know what I have set up wrong. Just don't know where to go from here. I was surprised to hear that there seems to be a solution to the problem.