Wow ,i rly like what u did there sir 
i always wanted to do a vr hud based on the use of leap motion and a 3d widget ,ill made it after this tutorial 3D hologram menu tutorial with Coherent Labs - part 1: 3ds Max and UE4 however iv never been rly able to interact with it ,could u bring some light into the way u used line traces and collision to interact with them? would be rly thankful ,also is this blui instead of coherent ui?