That's nice, and I really like the upper shelf idea.

Maybe grab some thick vines and have them go across the cage, and add an LED Moonlight so you can view night OPs.

That's going to be a fun display when the little one settles down in a bit.

Looking again, I think the body on that snake looks substantial and not at all thin. Perfect in my nonprofessional opinion!

When you release it into the new cage snap some pics as I'll bet the climbing after hours will be quite entertaining.