Hi Harvey,
  The howto works exactly as expected in a ESSG 4.1.2
  You don't need to create a boot.cat directory, it's created in the mkisofs command.
  We use a RH 7.1 for development. Both Anaconda packages are 7.1-5 version. mkisofs is 1.9-6 version.
  We know it doesn't work in a SME Mitel server, but as we don't have one we dont plan to make a howto about it.
  If you think you need more help, just read Red Hat CD Howto, sure is longer but will work for you.
  Also I have not modified the kickstart file. Maybe a vistit to RH website will help you.
  BTW, it might be because I'm not english spoken, but sure a little more politeness would help. Just a comment. We have tried, we know it works in ESSG 4.1.2. If you need more help, RTFM or ask in an educated way.
  Regards.