I'm trying to look up effects and abilities, But I can't seem to understand how blizzard created the replicant's ability.
I'd also like to know how to create hallucinations based off target units (Like SC1) rather than a pre-set menu.
Create units effects now seem to have the field "Effect: Type Fallback Unit". This specifies the unit whose unit type will be the one created, assuming that the "Effect: Spawn Unit" field is set to none.
So I would guess you would want to set 'Type Fallback Unit' to Target, keep 'Spawn Unit' set to None, and set your 'Effect - Spawn' to an effect that applies your hallucinationness behavior.
I think that Moship cores are intended to not turn toward their targets.
If you want to use it with the Moship core then you should just set the Arc for the Clone Ability to 360.
Looking at how the clone ability works, it uses the Create Unit Effect with the Fallback Set to Target as I suggested.
I am unsure what was preventing you guys from having it work before, I tried resetting all the other fields to defaults and it still worked.