Lots of typos in my first thread LOL!
I'd say there is about 4 inches of space between the panel and the perches. I have a hid below it that is within 3 inches. This worked great for the boa until he started getting thick and tall. I'd say in a 12" cage you be good with 7 inches off the floor.
I can pop these things out and back in really fast. I need to for cleaning and removal of some items. Wallace is all over the place right now I knew he'd love this stuff once out of quarantine.
Your SD is still a nice lean, agile snake and I'd bet she'd be an amazing animal to watch on perches!