Combining models for MBII?

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I've been trying to combine models for MBII by replacing the skins for them with actual other models i.e. replacing robed variations of Maul with maybe Vader and Sidious for an example. Doing this in the first place goes against everything I've known for frankensteining in Blender such is having to get rid of stupidtriangeoff but regardless of all that I know how to do it I just can't seem to figure out why when I export it from blender, blender renames the other model components and it combines everything and messes the entire model up. Sorry if this explanation is tough to follow but any help would be appreciated, maybe I'm doing the actual process wrong? I've followed the exact examples from other modders yet mine does not export how theirs does.