L. parahybana enclosure

@Dovey I also have to note: if someone needs/wants something similar but in smaller sizes, I think one could find small plastic seedling boxes (or whatever those miniature greenhouse things are called), and modify them to similar purposes. They're usually very cheap, too!
I am not a fan of sterilite boxes, they are usually not only uglier but also so much harder too see through.

Edit:// Seed trays or seed propagators! Had to check that out.

Looks great

@Sykomp "One thing to note is also the size of the gaps between the bars, and not only because the possible humidity issues."

This is a wonderful display and humidity is definitely a non-issue. Tarantulas don't need any specific humidity. I know, I know, every care sheet ever gives you humidity numbers - and they are all useless or wrong. A tarantula needs moist or dry substrate but the ambient humidity in the air is without consequence for any tarantula. Moisture in the substrate creates a small layer of higher humidity above the subtrate through evaporation where the tarantula sits and especieally where there most moisture sensitive organ sits: their book lungs. L. parahybana is very hardy, too, and though they like a bit of moist substrate now and then they can very well live in a completely dry environment, especially as an adult.

Restricting ventilation to retain humidity and chasing humidity numbers is a very dangerous game since it leads to stuffy enclosures that also retain bacteria, mold and other pathogens.

@boina I probably worded myself badly - It's just that if you leave those bars completely bare, the substrate dries out super quickly. It's not such an issue for LP, sure, (and probably this enclosure could be even better for an adult G. pulchra or G. pulchripes for that matter) but I still like to keep at least one corner of the enclosure a bit wetter. I find the plastic leaves to be a good (enough) solution, since they do not block the air flow that much but still narrow the opening a bit and prevent the substrate from drying out so fast. Without them it would be pretty much like an open top aquarium.