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Check Jamiestarantulas she has great T enclosures for slings. I have lot of them and extras so i have them on hand when i get more slings. they are cheap and include substrate moss cork bark if arboreal. water dish etc.
also, i think you should set up the versi enclosure so that it vertical. just take everything out, flip it so its vertical, make a cardboard dirt stopper, tape it in, THEN set it up however you want