I’ve tried to be clever and before I try to use the plugin i thought i will use your example from the first video (physics constrains) with the default vr pawn from the 5.1 vr template and it obviously didn’t work 
I’m not sure if you have looked at the default pawn but is it possible to do at all? I’d like to learn to change the value of variables between blueprints first and the default hands are more then enough for me the only issue is the clipping when handling gripped objects.
this is the error I got when I tried to modify the default pawn:
Couldn’t find bone None for ConstraintComponent /Game/VRTemplate/Maps/UEDPIE_0_VRTemplateMap.VRTemplateMap:PersistentLevel.VRPawn_C_0.RightPhysicsConstraint.
I gave it a name of the root bone of the skeletal mesh of the hand which cleared the error but it changed nothing in terms of the collisions at all from before I made changes.
also when I create a new character and follow instructions in the first video it all works lovely and as intended, of course I’d have to learn how to make the movement and animations to work with this character