wood will make a fine home for a corn snake, i sometimes use melamine vivs for my snakes that dont require huge really high humidity levels and as such dont need misting as often (as melamine warps if wet),
i would say the minimum size enclosure for an adult is 48" x 13" x 18".
it would be even better if you could give them 48" x 24" x 24"
i use ceramic heaters controlled by a thermostat so im not 100% sure how well a heat pad would work with a wooden vivarium,
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