Somewhere I saw a post from Epic Staff saying the Material Layering system is on hold and not actively under development anymore and that anyone wanting to use it will have to maintain it. I understand that with the new rendering system under development to support realtime raytracing is to blame for this, so it does not make sense to work on something which depends heavily onto something still under developement, material layering and realtime raytracing respectively. So, I have a project used to test some ideas that turned great at the time, but after the statement it will need to be reworked hard and probably will not be elegant or simple as it was with the material layering. 