I've been following your guilde.
I have created a Maverisk from Myhack. And I have successfully installed the Mavericks on my hard drive. I have to boot from USB Maverick Installer, everything seems temperate ... But when I use your Extra folder, I can not boot directly into the Mavericks are installed on the hard drive ..
I used myhack to Install Extra folder and install the kext NullCPU - (I deleted Myhack.kext). Then I used MyFix (Full)
Everything works fine when I boot from USB.
Sorry about my English
Pls help me!