My scratch-built viewer screens worked out pretty well.
I welded together the laser cut layers yesterday and then used my table router to put a 1/8" radius on the front outer corner (for some reason, I can’t seem to find roundover bearing bits in metric dimensions).
I still need to do the same on the inside around where the screen sits, but that part came back from the laser cutter out of tolerance, so I have to order a replacement before I can do that.
I’ll do some body filler and glazing work and then prime it and then I’m pretty sure it’ll come out looking much cleaner than the vacuum formed ones. And the payoff is this:
The back panel seats perfectly into the screen housing, and I already have pre-cut holes that I’ll put threaded inserts into to hold everything together like on the originals.
Except that mine will have a nice clean robot-cut profile. 
If you have an HMS kit, this design should fit nicely over the cast base. These are the laser cut parts you need:


Monitor Body Side.dxf (2.5 KB)
You’ll need two.
Monitor Body 1.dxf (6.0 KB)
Monitor screen frame.dxf (6.6 KB)
25mm
5mm
8mm
Monitor Body 2.dxf (21.5 KB)
Monitor Body 5.dxf (8.0 KB)
Monitor body 6.dxf (68.8 KB)
Monitor body 6 insert.dxf (50.7 KB)
Monitor jig.dxf (47.3 KB)
This can be used for registration when gluing the layers together.