I converted the meshes to SE and fit them to the CBBE Physics body.
What they are, is alternative body types for female NPCs and player characters. Also comes with optional HDT physics, for, y'know, those areas. Delete CBBE body non physics (marked as green) - Import as nif CBBE body physics, right click, set as reference (will be marked as green). What do they mean, generally? I really want a body type like the screenshots in the bikini armor pages. The Preset drop-down determines the shape of the Body/Outfit you see in the preview and when Building or BatchBuilding. I've installed and activated UNP Female Body Renewal.
so i follow the steps in the readme files, and i have successfully created a bunch of files. Build Physics body (I used CBBE Special, as that seems to work for both CBPC and HDT-SMP).