Even corrugated cardboard or poster board (comes in black or white+, with a foam core, lightweight & about 1/4" thick) are good insulation options too.
And if you don't want to "see" the insulation thru the glass, you can tape on scenery first if you wanted to. (I'm a glass tank user, can you tell? lol...)
I prefer top-opening cages myself. I've had both, & while you don't want the snake to get the impression that you're a predatory hawk swooping in on them,
it's not that hard to signal what's going on so they aren't freaked out or thinking that you are "incoming-edibles". (see 'tap training', etc)
And by the way-
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