I went out and bought a new internal hard disk and then restored the piker file to that drive with the same error. So I think Piker must not work with something on these machines.
Please try building the installer yourself. It is always possible that a few bits of data during the download of the installer dmg are getting corrupted and causing problems. Either use SFOTT or follow the guide in the first post. I have not encountered ANY of the errors that are being reported and have done the install dozens of times.
Have you tried booting in verbose mode so you can see where it is getting stuck?