I think for the Crait CS map they could just do the outside area with all of the tunnles and trenches and the hangar area of the base and just put destroyed
LEGO Star Wars Battlefront 2 Battle Of Crait from The Las… | Flickr
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A Young Rebel Soldier Salts the Rim of His Margarita Glass on Crait in a Star Wars: The Last Jedi Parody