While I am waiting for Aluminium extrusion box case for LimeSDR board, I managed to cut the protection plates from Plexiglass.
You can download the CAD files from our LAB’s website: Plexiglass board protection [Lithuanian]
https://olab.lt/uploads/myriadrf/original/1X/191882b177edb13aa5429755a73c973e87cabda0.png