I did it. A lot easier than I thought to be honest, bought some 4mm polycarbonate cheap, and found it very easy to cut with a decent hacksaw. Just a load of trial and error to get the shape just right but fit nicely. Took most of a day down my lockup with some card to make as a template of the old glass and a hacksaw.

Going to make me own sliders soon as looking at it, it really isnt that hard by the look of it.