Sharing my Hololens 2 Experiments for anyone who might find some value with it. Currently have there “Grabbity”, a Half-Life:Alyx style grabbing mechanic implementation, hand/joint drawing for debugs, gesture tracker, stuff for hand physics interactions, etc
All implemented in Blueprint, assets, components and actors made to be easily migratable across projects. Might convert to C++ at some point.
The Alyx style Grabbity mechanic is actually a re-implementation in AR of BP code I’m hoping to include in a UE4 VR course I’m making for Epic. Don’t want to pre-empt that, but I did leave code comments and nodes to indicate parts that you’ll need to re-hook for the VR implementation 
Enjoy!
Demo: Hololens 2 Experiments - Demo Level - YouTube
Code: GitHub - 1runeberg/HL2Experiments: UE4 Hololens 2 Experiments