Sue had a wine bottle from a wedding shower we thought to slump and make serving tray or at least an art piece for the couple.
Bottle just fits
Partway done. Glass melts around 1475 degrees and the slump once it starts goes pretty quick. We used the color seen through the peep holes to guess a 1000 hold and to see when the slump started. To stop the slump opening the lid periodically to drop the temp to 1000 again and then over night to anneal.
Turned out OK or at least it is not a puddle or shattered.
Check this out. Look at how she flips the switches to change the pickup configuration and the sound. It's a Parker guitar with a piezo bridge and two humbucker pickups