Moving to Open Directory from AD

We have a AD box and we would like to replace it with OD on the Xserve running 10.3.8

The Xserve already has all the users in the OD database

What I want to know is how do I go about making the Xserve a PDC too

And what issues can I expect

the AD box handles only one domain. but I can’t bring up the Xserve with the same domain as a PDC.

So if I change the domain in windows services in Server Admin and bring it up will there be any issues having the AD box as “PDC” for one domain and the Xserve being the PDC for another domain?

Also if the OD master is setup with the first domain will it authenticate the machines on the other “new” domain?

so in summary
AD box is master for example.com
OD on Xserve is setup for dc=example,dc=com
can Xserve with OD for example.com act as PDC for example2.com

And if I add a machine to the example2.com domain will it authenticate off of the dc=example,dc=com OD?

I hope you guys understand me after all that I almost confused myself