WIN2K PDC w/WinNt 4 BDC

I am trying to convince my boss that in order to have a Win2K VPN you have to have a Win2K PDC for user authentication. I currently found a work around for this, but I would like to configure the network the right way. I need to know what are some of the problems that everyone is having with setting up a Win2K PDC on the same network with WINNT 4 BDC’S? (Please don’t tee off to hard) 🙂