Hello Tim,
thanks for the praise and your observations.
The idea with the second product is very good. If this one takes off, I may just do that.
However, there are shards of various sizes in the jar, and for example in my demo wall with the window I used pieces of glass that came from the jar, glued into the window from behind. If you want the glass to have a really straight edge, you can sand the shard with a file or some sandpaper.
I´m just checking your project, VERY interesting to say the least and I´m amazed by all the research you did. I´ll make sure to include some bigger shards in your jar.