I happened to be at the trash transfer station on a Saturday morning and the employee was whining he couldn't take the garage doors because of their size.
The guy with the doors was very glad to deliver them free of charge, say thank you and offer more! At the time, I had no idea what to do with them until I bought 5 pounds of chipped, broken cells. Each panel holds 15 3"x6" cells. I used silicon caulk to seal the edges put another strip down the middle of the cells to stabilize them. I'm leaving the seal breaks in the 2 corners to see if moisture will accumulate and if it does, I'll fill the inside with CO2 and seal. CO2? because it was also free.
I have 6 panels and all of them have different dimensions of glass. Make sure the 2 pieces of glass you want to use in each panel fit before you assemble the cells into the panel.