I will use the same technique that is used to mount a piece of circular glass (like a rondelle) into a window. We use an "H" shaped piece of lead came and wrap it around the glass. The other pieces fit around the plate into the design. I plan on using different types of architectural clear glass so that the accent will be on the depression glass. Once the window is complete, I will place a sheet of plate glass on each side of it to protect the plates for any type of damage (flying rocks from lawn-mowers etc). That will also help provide support for the window.
I can't wait! I love making the stuff, but as a result of going through my parent's stuff and time it has taken, I haven't had the pleasure. I have an "antique" lamp that I have to repair for a lady, but it will be a short, simple fix! Just cut and grind. . . no leading or soldering :-(