Each individual panel quadrant consist of minumum three layers.
Baseplate - Bottom part. Planned to use 1,5 mm Aluminium
Lightpanel - planned 5 mm thick Acryl or PVC (depending on backlighting of panel utilized or not)
Overlay - Printout on transparent film and placed on top of lightpanel (I think you get the picture)
Not shown here are the basic sizes for planned PBC, Holes in Baseplates and Lightpanels are prepared