This method of importing the third person project seemed to work much better than migrating assets.
It helps to use git to clean up the unneeded changes to your project.
I only kept the stuff under Characters/Mannequin_UE4 and Mannequins. That’s the stuff you need for meshes. You can actually omit Mannequin_UE4, but I kept it to help retarget.
I was also able to move those assets into a totally different module’s content folder and am working on modifying the skeleton for my game with slightly different ik bones.
When I did this previously I kept getting all sorts of odd errors or warnings or assets not cleanly migrating over.