I like the hub idea.

There is an option in app_rpt to allow for nodes connected to the same server to play the ct like there is nothing connected.

I wish someone with more coding experience could add a feature that any node could be considered local even though they exist on a remote server.

This would allow for a sysop to have a series of raspi or bbb servers tied to a hub and act like one server. 

With the success  of the little computers doing one node servers this would be a great idea.  Almost like a dumb version of a RTCM ( or a smart version  depending on your opinion.).

A local.conf file or a stanza could list the remote servers that are treated as local. 

This would make this project easy.