I still think you should put a carpet in there. Especially with that branch. A burm might climb it, fall, and hurt itself.
Actually, I decided to get a carpet instead. The more I started researching, the more I realized it was more than I could handle at this time (someday...sigh). So now I'm on the hunt for a jungle carpet.
That's coming out great! I really like how this isn't one of those posts where someone starts a cool idea and then just fails to post the results. Very interesting!!!