Yes, sandwich-style case. I use a lot of software in my line of work, but this one I laid out in Corel. For layering technique I simply worked out logistics of what would work in conjunction to the switch depth compared to the PCB and stabs, etc. My go-to for sandwich-style is:
2mm switch plate
3mm second layer
5mm middle layer (main glow layer)
3mm bottom layer
and then feet, however it needs to be worked out for the project. So in essence the "plate" is effectively 5mm thick.