Just wanted to thank the author(s) for putting together such a wonderful and easy-to-follow guide, including helper files.
I have been successful in installing Mavericks on an ASRock Z68 Pro3 motherboard with an Intel i7 Processor and GTX 650 graphics card. I did have some trouble at first with sound and PS2 controller (I'm using an older KVM switch), but I worked through them with the help of Google and some of the many helpful posters on the internet.
One thing I did want to mention here is that at first I had no luck at all getting the Flash Drive with the Mavericks installer to boot up. In fact, after fussing with it I went to another installation guide only to get the same result -- boot up flashed a mac apple screen for just a second and then rebooted the machine every time.
Finally, I found the problem, and then returned to this guide to finish up the install. I'm sorry if the solution should have been obvious, but it just wasn't to me:
In my Bios, I had been cruising along just fine with Windows 7 with a setting for "No-Execute Memory Protection" of "disabled". Even though I had not found any guidance on this, I just randomly changed it to "enabled", and then the Flash Drive with the Mavericks Installer booted up just fine.
As I say, maybe it should have been obvious, but perhaps someone else who also overlooks this can benefit from this post.