I will definitely close off the front screen.
With the ventilation blocked off( notice the towels on top ), a humid hide, a big water dish, and frequent misting, I don't think a plastic cage would really be any different. I've used plastic caging before, and I found that it harbored a lot of bacteria in comparison to a glass cage. I know many snake keepers are very against glass cages, but I use them for all my reptiles and prefer them over plastic. My substrate is a mix of cypress mulch and repti bark, so I think I'm okay there.
Trust me, the snake is struggling; not to say I'm not.
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