I struggled with this myself - in fact I looked and searched for several weeks not even a few months ago. in the end, I ended up going acrylic w/ CFI. Jason over there knows his stuff an treats his customers well.
in passing with Tracy (littlefishies) on the forums here, I learned she was able to locate a custom glass builder in canada about 5 hrs north of her over in Eastern Washington. If you're stuck on using glass, it may be worthwhile to see who she found.
good luck!