It is plenty big for reasonably sized adults. My not quite 2 year old 2200 gram Enchi girl fits in her half of a divided T8 just fine. Would I put an adult that was closer to 3000 grams in there? Probably not.
Also, concerning weights, I only weigh them empty (after they poop, before they're fed again). This gives you a better idea of their actual growth.
Edit: She's probably big enough to move up in size to rat fuzzies by now. Many BP hatchlings will take a rat fuzzy right out of the egg.