Yes that's very good indeed. I used the Mustafar matte as well. I'll post later. I do think it should be further away from the planet though, as that is the reason Mustafar is so volcanic, because the tidal forces of the planet are so strong. To develop into a stable, habitable world, the Endor moon would most likely be quite a bit further away. And most gas giants have rings. I found it odd that Geonosis, which clearly isn't a gas giant, would have a ring, as it certainly doesn't have the tidal pull necessary to hold rings.

I prefer to keep the science as real world as possible, so I'll be adding rings to mine.