for flat glass I did try to put in my cheap tile cutting machine (Harbor Freight) and it cut a straight line like cutting through butter. I did cut my chopped windshield with a sandblaster for my el camino. worked great till I tried to smooth out the work with a sander it cracked I should have used water.
I still have been to lazy to try putting a couple of layers of aluminum tape on the glass and try to cut it with my plasma cutter. The el camino is gone but still have plenty of glass to experiment with. ED