Migrating existing OD setup to run as PDC

Hi All,
We’ve run an exclusively mac shop for a while, but we need to add some windows workstations for our Engineers to use their CAD programs. We migrated our Directory server from a simple setup to advanced. As such, we have some configuration issues I can’t seem to solve. Here is our current setup.

Hostname: spidertracks.local
root dn: dn=spidertracks,dn=local
Kerberos Realm: SERVER.PRIVATE

This Kerberos setup doesn’t seem to be correct as none of my windows clients can join the domain which was properly set up in samba. I can’t find any errors in either samba or kerberos, so I’m unsure where to start diagnosing the issue. I’m assuming it’s because my Kerberos realm and my windows domain don’t have the same name. I’m unsure how to manually migrate everything. We have everyone’s mobile profile and home directory synchronization working, and I’m afraid I may damage the directory configuration and corrupt user’s profiles. Here are my requirements.

1. Run 10.5 Server as open directory master
2. Run 10.5 Server as Primary Domain Controller for windows client
3. Allow access to all network shares from both afp and samba clients
4. In file created with samba default all created files to group spidertracks

In order to do this, I’d like to migrate our dn from spidertracks.local to spidertracks.com. I’d also like to change the kerberos realm to SPIDERTRACKS. How do I go about doing this without destroying my existing setup?

Thanks,
Todd