You are almost done!
Check
1. e-smith servers ip is gateway and DNS server for all clients in your network (including NT-Server).
2. Better do not use dhcp from NT-server.
3. You can ping outside world (e.g.
www.disney.com) from the server console?
This should be it. Follow client-setup instructions from the e-smith manual. As last fix you could/should disable dhcp on NT box and (if needed) enable it on e-smith server.