Hi KevCar,
I though you just has a network from your clients from your first post. Sorry for the misunderstanding.
I think the best approach is setting up NR client on each computers on your client site, this will give you a virtual LAN and you can use the built-in ACL/firewall to protect those computers and use NR user accounts to mange it.
BUT, if you don't like it, an alternative way would be multiple site-to-site VPN, i.e. you may want to use the Network Bridge feature of NR to link multiple networks. You can choose the "Routing" method instead of "Bridging", as those networks have different IP range. The only thing need to do is setup the NR client/gateway on each network to route packets. Those networks can be fully meshed.
For the detailed information about "Network Bridge", please check out here:
http://www.neorouter.com/wiki/index.php ... ork_BridgeThanks,
KevinZ - NeoRouter team