The Foundry seems like the perfect building for making glass, but this seems to not currently be supported by the mod. It would be especially cool if the production chain involved melting stone into molten glass, and casting the glass plates from that.
Also, since both Moshine and Maraxsis both feature glass as a material of their own (in Marxsis' case, reinforced), perhaps a bit of collab with their authors to normalize a unified production chain could benefit all three mods?