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It may be that glass can be re-shaped with fairly cheap tools. Remember those stretched soda pop bottles, with the paint apparently rubber-banded along with the glass? Big ovens can be made of cheap and junk stuff - the most important part is a fan with the motor on the outside. Circulate hot air, and trap the infrared for even heating. Given time, glass might slump nicely onto the same kind of wood and flannel forms used for plexi. I'm glad we don't need tempered glass, but that is not impossible, either. It's just an effect of a controlled blast of cold air.
If someone is using electric resistance heat anyway, and has a spare chunk of auto glass, they might run a cheap experiment in their kitchen oven . .
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