Given the choices, I have to reluctantly choose foolish. The plywood will warp anyway and glass doesn't bend. So, your glass liner will no longer fit inside of its plywood shell. Window glass is thin. So, the pressure from the warping wood may crack it. Even if you managed to scrounge up some thicker glass, the alignment is still going to be off. How that affects your enclosure depends on how it's designed, but imagine doors that no longer close, that sort of thing. You'd also have to be very careful working in the enclosures and moving them. How nerve racking! So, I don't think adding glass will make plywood enclosures more durable. I think it will make them dramatically less so.
Now, I respect your DIY spirit. I have it, too. I can't pass a piece of litter without wondering whether I could use it in my enclosure. So, though I've raised some potential issues with glass, they are just potential issues. I've never built an enclosure like this before. There may be solutions to all these concerns. If you still love this idea and want to give it a go, I suggest you start smaller. Instead of ten bioactive ball python enclosures, try making a jewelry box lined with glass. If it turns out o.k., you can give it to your mother for Mother's Day and start thinking about how you can scale up the size. You'll have fun and learn some important lessons without the pressure of having committed serious resources to the effort.
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