Thanks for replying!
Yes, all systems will be the same (probably Dell server, 2x500GB, 4GB, 2 NICs)
with 3 standard users and 3 standard ibays;
root password will (should ?) be different;
Each will have a ddclient to a subdomain name within a domain.
The SME will be a gateway behind a router but this will be customized on delivery.
LAN subnet is unknown at the time of setup.
partimage or ghost would work?