[Samba] Samba multi-site advice request please

[Julian Pilfold-Bagwell]

Hi all,

I am looking at setting up a multi-site office and need to put a plan
forward.  The site consists of one head office and several branch office
and my plan so far is this:

In head office, one Samba PDC.  Each branch office will have a local BDC
that also stores files local to the branch, hopefully cutting down the
day to day traffic across the VPN.  The VPN I plan to use is OpenVPN in
bridge mode in order to allow broadcasts e.g. WINS etc., to traverse the
connections.  All the servers will have their own LDAP server and all
will be synced to keep the authentication consistent and reduce VPN
traffic.  Each site will have it's own DNS,  the PDC being the master
and the BDCs slaves. The low number of machines involved mean I can set
the clients to use their local DNS.

The whole plot will be required to run across 2mb SDSL as this is all
the budget will stretch to.  

Every other proposal has involved server 2008 and terminal services but
I really want to go down the Linux/Samba route.

Is there anyone out there that has successfully pulled this off and can
give me some advice?  I've spent a few hours searching Google but their
doesn't seem to be any definite info/howtos.

thanks,

Julian PB