Well, if it is any compensation, it's not just Arnians; they have a taste in furniture for all reptillian species.
I think the only time we have played on core worlds is in the latest episodes on Spiridos and Cassilis. You get a correspondingly different game; heavy on the investigation/social side.
Damagran is a signifcant social signpost because one of the points of it was that it was at the edge of what people would refer to as central Republic civilisation in that direction. It is the last bastion of the Republic, beyond it you are getting into more lawless territories. That probabl;y puts it far out on the Mid-Rim, and gives a hazy indication of how close the Sith were at that point in history as opposed to the whole Zeiton thing, which implies the Sith normally hung around MUCH further out.
Tartarus is in the Lamella system, near Malastare; Malastare itself is kind of a halfway house between Republican civilisation and piratey nastiness and is also Mid-Rim.
The Dark Siders work from the outside in. Worlds like Demarus are as far into the Mid-Rim as they are ever going to get; we won't see that kind of thingfor... well, possibly ever. Gonderkorro is Outer Rim, btw. But then so was Fernau- you need to be VERY far out into the Rim to get out of range of the Bureau.
Okay... Rex, Ush is being mostly vague, so we can put the planets practically anywhere as long as we stay in the same Inner/Outer Rim! 😄
*tentatively adds Tartarus to his edited map of the Galaxy*
We were thinking Zeiton would be out beyond the Unknown Regions, Ush, right on the very edge of the Galaxy somewhere?