Your pictures are great and I think the questions of what makes up the tuner cover and clips are the real issues. Have you tapped on the cover to ascertain if glass or acrylic, and any evidence of scratches on either? Obviously acrylic would be a lot easier to work with but today, glass might still be easy to drill IF the correct company can handle it, wonder if it even could be drilled or cut with a laser? But both acrylic and glass can then be finished to a high degree to be very clear and classy, its primarily the hole drilling and edge finishing that is the issue.
The clips could be a metallized plastic, or a cast aluminum part which has been polished or anodized (which is relatively easy to do at home), probably looks like a U shaped piece with two inside the U cylindrical protrusions which are drilled and tapped for attachment. IMO, if you know a machinist friend, might be possible to machine from billet, or create a sand cast mold and make a few rough aluminum ones which then can be finished and anodized. These clips are not holding a huge amount of weight IMO.
Otherwise, consider a 3D printed version if you can get accurate measurements and create the correct CAD image. 3D printing can be done with plastic or with metal depending on the printer. So, IMO, both the glass/acrylic cover and the clips can be remanufactured, just depends on how ingenious you want to be.
