Ptolemy and ortelius are, in the long run, *not* meant to be used by toolserver users. Those boxes are explicitly separate. You can't run a production database when users are running all kinds of inefficient and uncoordinated queries on it. :) For now it doesn't matter, but keep this in mind.
Okay, then we'll (*) need to mirror the dbs (postgis & osm-db) somehow, so the toolserver users can use it.
Cassini is a toolserver, and managed by Wikimedia Germany. They do things differently than WMF, coordinate with them to see what works there.
Peter
(*) we, that are the tool authors :)