Have you tried the exo terra extra large hide? It's pretty dang big. And very heavy so it will be difficult for him to move around. Read some of the reviews in this one to see what snakes are fitting into this thing lol
http://www.amazon.com/gp/aw/d/B0002A...041641-2413449
Or maybe even one of the larger reptile basics hides. They have large, extra large, and jumbo and have the measurements for each hide. He has to fit into one of these things.
http://www.reptilebasics.com/hide-boxes
I hope this is helpful
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