Hi seandennis, i did implement this control method in UE4, you can try a demo and read a long explanation here:
https://forums.oculus.com/viewtopic.php?f=32&t=18422
As for the exact implementation details, these couple of posts i wrote a while back should get you started:
Having said that, obtaining the neck position should be much easier soon, as Oculus just provided access to this info directly through blueprints in their latest experimental UE4 branch, something that wasn’t possible before.
I think it’s still not implemented on the standard UE4 release though (haven’t checked the 4.8 preview yet, maybe it’s already in there).
Hope this helps.