I'd like to make a suggestion:
I was thinking about making the world affected by the MUD have a random chance of either being a Terran or Terran Eccentric (in vanilla) or archipelago or continental (with unknown skies) when the terraforming process is complete, which are relatively "earth like" worlds.
The effects on conditions and whatnot would remain the same, it's just the world type what i suggest would be randomized. I'm suggesting this for variety sake and to add an element of randomness to the device.
Thanks!