Any plans on fixing the skyboxes?

[Romulator]

Sounds like a project to work on. Fixing older mods with skyboxes that is.

You'll need the original six images which make up the cubemap to do it effectively. When the cubemap is exported as a .dds, if you were to preview the image or open the .dds in an image editing software, it won't look like the raw six images but rather an interpretation of how the cube will look in game.

Using CubeMapGen, you may be able to extract the raw images into a new .dds, then change them, export, then apply them to the new levels, but I have not tested that.