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Here we go... I'm cautiously optimistic after TLJ, but after seeing this teaser and hearing some of what we can expect at the Celebration panel, I'd be lying if I said I wasn't a bit excited. Not sure on the title, though.

First of all, you don't need to and probably shouldn't change the race. In most cases, you also don't need to change the model. You were getting crashes because you entered a model that didn't exist. What you want to do is change your appearance line so it looks like this: modela texa P_BastilaBA XYZ_Bast And then take a copy of P_BastilaBA01, edit it however you want, and rename it to XYZ_Bast01. Substitute XYZ for whatever prefix you want, anything that guarantees it's a unique file name, not used by the game or other mods (e.g. I would go with something like JC_Bast or if I had to do several different ones, JC_BastA, JC_BastB, etc). Appearance.2da has essentially two options. If the texture cell is empty (****) then the model will only render any textures that are on the model. When a string is input (e.g. P_BastilaBA) it is used as a prefix for the texture. This gets added to the two-digit texture variation on the item (default 01) giving the final texture name (e.g. P_BastilaBA01).

Typically a level will have numerous lightmaps. I believe the Upper City Cantina, of which the arena is but a small part, has something like 60. The ceiling of the arena uses the same lightmap as the rest of it. Your problem is likely that the lightmap is terrible and the area in question is only a few pixels.

Lightmaps are assigned per mesh in the same way as diffuse maps, so no, they can't be renamed without editing every instance of a mesh that uses them. But that wouldn't gain you any real advantage anyway. You can edit the lightmaps and place them in the Override. They are unique, so there is no issue with doing so. However, you won't get much mileage out of trying to manually edit them. I think this is the sole lightmap for the entire arena:

Lights are in the level models. But Odyssey uses baked lighting, so those lights aren't the ones that actually light the scene. If you wanted to change the lighting, you'd have to recreate the lighting in Max/GMax and bake new lightmaps. Pretty much nobody does that because it is a complete pain in the ass (and in many cases impossible to accurately recreate anyway).