Absolute Battlefront: Galactic Conquest aims to be the most complete Galactic Conquest mod ever created for Star Wars Battlefront II. The usual issues regularly seen in GC mods such as the Yavin model blocking the camera zoom, planet models not spinning and fleet ship models not appearing over the mod planets have been fixed. Additional features include custom planet models, multiple GCs being selectable in the menu, custom heroes, custom loadscreens, and covers a range of eras and maps created by the modding community. Previously called Absolute War.
New Kessel Planet Model
But kessel is an asteroid
If it's Legends then you'll be (kinda*) right.
But in the new Disney Canon, it is a proper planet (you can see it in the very first episode of Rebels, the Solo movie or the last The Clone Wars season of 12 episodes).
Besides, there might be engine limitations in which you can't change the shape of a single planet, only change the texture. In that case it will be impossible to do it unless you want every planet to look like an asteroid.
* It looks like an asteroid because of it's irregular shape, but it is still 6500-8000 kilometers in diameter; that's more than half the Earth diameter (~12700 km). So I don't think calling it "an asteroid" would be correct. Besides, in the real world Kessel should be a ball at this size, but it does make it less interesting looking.