The thickness really would not matter. It would take longer to heat up but would be more stable and efficient once warm. Read up on the principle of heat sinks and/or thermal mass if you're interested.



Still, I think there is a point of diminishing returns and I would keep it as thin as possible while still offering sufficient strength so it does not crack. Some extra large granite tiles are supposedly quite fragile. Personally I would use slate, although some of them can be particularly fragile, especially the heavily patterned ones. Structural slate out of Vermont would be better but a lot more expensive and harder to find. Unless you live in Vermont.
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Current snakes:



0.0.1 Gonyosoma oxycephala - Java locale (green)



0.2 Gonyosoma oxycephala - Malaysian locale (green)



1.2 Gonyosoma oxycephala - Java local (green)



2.2 Gonyosoma janseni - Seleyar locale (all black)



1.2 Gonyosoma janseni - Celebes locale (Black & Tan)

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