Exactly this. Build the version of CBBE you like in Bodyslide. Then copy it over to the body meshes folder of your follower. That's the way it works. That method works, but the default meshes path already has the CBBE body files, and I know there is a way that the npc's can use that body files without copying into their own name folders. I have a mod containing 20+ npc's, so its bit unnecessary to copy same body files each one of them to save disc space etc. I have similar follower mods that do not have any individual body files but use main path CBBE, just curious how they manage it.