Excellent article Jessica...thank you! What I took from the article is that for an adult, my enclosure is just about the perfect height. Also, the article seemed to encourage extra horizontal space and didn't suggest that it would stress out either species.....

"Horizontal space is far more useful than vertical space when considering the activity patterns of these snakes. After nightfall, these animals become active and spend their time crawling through the trees moving from branch to branch."

I would still like to hear from anyone else who may have some input...especially if you keep a GTP in a horizontally oriented cage.

Thanks!