Help with RMS/relay

HI, I'm working with a customer who has purchased the Enduser Web Suite and Virtual Web Appliance.

This customer has approx. 225 clients PCs, half at their HQ and the other half at remote locations without VPN access or any other access to their main facility.

They will need the ability to use RMS and a relay server in order to manage their remote PCs.

I've only found a couple of pages covering this topic:

1) Enterprise Console: configuring message relay computers:

     http://www.sophos.com/en-us/support/knowledgebase/14635.aspx

2) Using Sophos message relays in a public WAN:

     http://www.sophos.com/en-us/support/knowledgebase/50832.aspx

Are there any other pages or documents that cover this topic with step-by-step instructions?

BTW - Their addressing non-public, i.e., 10.1.3.x (local HQ) & 10.10.1.x (DMZ)

Thanks

Joe