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Ah, lattices are Blender specific and will not export to Unreal Engine (unless through baked Alembic vertex caches). In order for a character to export to Unreal Engine, I need him *.FBX compatible - in other words principally baked deformer bones driven by constraints internally in Blender.

Dude, just to say. Thanks for all the comments and interaction on my posts.

You really put a lot of meaning to this community, and I am happy to see you keep at it. Thanks again.