I like the idea.
I do wish Xsyon would be able to create a more complex craft/trade skill tree as the game progresses in time. New crafting skills like this should be made available to those that have reached a certain level in other several other skill areas (in addition to obtaining that elusive skill book/pattern/recipe). Perhaps you must have a high level in Pottery and Fire Making (campfires, foundries, baking ovens, etc.) before you can take on the Glassworks skill. What I am trying to say here is that this should be more of an elite skill that perhaps not everyone would like to pursue.