NT to 2003 upgrade

I am in the process of replacing my old NT file server with a new 2003 server. For the time being the domain servers will remain NT. Here is my plan. I have set up the 2003 server (print drivers, shares, etc) and copied over all of the data files. My plan is as follows:
1.Unplug the old server (abc_fs1)from the network.
2.Rename the new 2003 server to abc_fs1 (old server name).
3.Assign the new 2003 server the old servers IP Address.
My questions is, are there any potential issues (problems) that I should be aware of.
Thanks,
Mike Peck