@ramsey You're talking about UUID, aren't you? If so, then wouldn't call it VO even though it behaves like one due to encapsulation.
I've only skimmed through the repo. Too many classes for somone without domain expertise, so I can't connect all dots in my head to talk about refactoring. Customization seems pushed too far though - especially providing FeatureSet of all(?) objects used in factory looks weird to me.