What I did was slightly different.
I kept the DHCP server running, but made the dhcp addresses for anonymous dhcp-hosts overlap. dhcp3.conf was configured for those addresses omn the core. During the installation of the MD I still didn't get the expected result... so I continued and later tried to make a MD of the Hybrid install...
changed the hostname after install...
and then allowed it to connect to the core with root as username...
that worked to connect, but failed to launch the orbiter since the ID was not in the database...
i will try to see what more I can do