I was thinking along the same line- for a terrestrial snake, I'd use the vertical space by making it a split level somehow- so there's something (like a "shelf" with traction, of course) that they can easily climb up on & over, or hide underneath, for most of the enclosure length. That would make good safe use of the space for the snake, & encourage them to move around while still having what they need to feel secure. Most snakes love a good "basement".
(Now if we were talking about cage height for my rat snakes or similar species that climb well, my answer would be "branches". But not for BPs.)
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