Okay, just picked up my plexiglass, cutted to dimension and folded at an angle of 70°.
.
Have just to drill the needed holes.
(2 hours later...)
LCD is completely mounted and functional.
Actually the wiring and the LCD PCB are still visible.
As soon as I have cut the window in my PC-70 I recuperate some 1mm thick brushed alu, and with that I will make a framework around the LCD with an opening for the viewable area.
On the base all screws are sunk.
Four adhesive rubber feet keep the whole thing stable onto my desk:
CD