Hi Sascha,
I found a site that reproduces antique window glass for restoration projects. This will give you some idea of what I’m looking for in way of a glass material. Notice the waves and imperfections in the glass. The glass that I had in my house had not only the waves, but also random tiny bubbles or pinholes that could be seen up close. It was present in the book case door glass along with outside window glass.
https://architecturalglass.com/collections/restoration-window-glass
Also, thank you for getting back to me regarding drawer gaps. It is much appreciated!