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Thanks for sharing! Your enclosure is finely designed.
I don't see air holes. Do you have any for air flow? It is important to have those.
For moisture, G pulchripes dont' need high humidity. A water dish and sometimes (once a month? or when a molt is imminent) pour some water on one side of the substrate should be fine, specially in winter because the air is very dry in our flats.
Maybe you could add some substrate: it'll help for moisture and prevent any damages if your T falls.