I would rout two levels, an area to fit a piece of glass of appropriate size so that the glass would be flush with the cage floor, and within that area so as to create a lip for that sheet, a deeper area that I would put a bottom layer of glass or ceramic tile and the flex watt like a sandwich. Then you would have a smooth-top snake heater. The flex doesn’t need air. You could use sheet metal, but the glass would be easy to clean, waterproof, and I think it would look pretty cool. I wouldn’t use plastic. You might consider this whole thing something you could build and attach to or set on the floor instead of routing into your plywood floor.

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