Just like the Warthog project, I use 3 mm black acrylic as a base for modules that holds LEDs, switches and buttons in place. a sandwich from one 2 mm and one 3 mm white translucent acrylic sheet is used on top of that to diffuse the LEDs and will be painted and engraved later. Everything is held together with M3 standoffs.

A couple shallow holes have to be drilled into the 3 mm white acrylic to make the LEDs fit flush into their mounting holes.