Last Updated: Aug 09, 2017 Views: 38
I have attached a bibliography of resources, including websites and videos, that deal with theories about ancient glassmaking techniques and furnaces. It sounds like you are familiar with E. Marianne Stern's experiments with blowpipe technology (in the 90s).
Take a look at Mark Taylor and David Hill's Roman Glassmakers website (http://www.romanglassmakers.co.uk/) Their website says: “We specialize in researching the techniques involved in making Roman glass vessels, and in reproducing Roman glass using fusing and slumping, mould-blowing and free-blowing techniques.” Embedded below is a video by the Getty Museum of David and Mark at work.
You may be interested in seeing this book: Hot Pursuit: Integrating Anthropology in Search of Ancient Glass-Blowers by Alysia Fishcer from 2008. She builds an ancient-style furnace and experiments with techniques.