You will need the Install OS X 10.9 Developer Preview.app or the InstallESD.dmg from it to create the USB installer. You can download the OS X 10.9 myHack USB Installer Beta here and follow the guide there as well. To donate to the myHack project you can do so here.
Please report any bugs with the install process and USB creation process. Do not post about post install issues such as Audio or USB 3.0 not working for example.
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