Hi,
I am using NFS automounts for a similar setup. The homedirs are physically located on one server (Server02) only and all the others are NFS mounting to that.
The server that holds the physical home dirs are also the NIS Master and the others slaves.
Your auto.master should look something like this:
/home/e-smith/files/users /etc/auto.home
and the auto.home
* -fstype=nfs,soft,intr,rsize=8192,wsize=8192,suid,udp server02:/home/e-smith/files/users/&
Rgds,
Jesper