Your right about the hole ,it was a little careless of me to mention, when you cut the pot try to leave the hole on the piece you don't want. I find that thinning the sides toward the back of the pot makes it lay closer to the substrate making a much more "secure" feeling hiding place for you snake.Just my opinion there though.
without further adu heres the diagram just to show you what I mean( I am not an artist
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