Yes, that was my consideration, the quart size is huge. I know you guys don't even use that much for your adults, but I also considered that those are the underbed type which are only 6in in height. I want mine to have a little more room to climb just because she seems to enjoy it even though she doesn't need it, hence the 12 inch height instead of 6, which is why the quart size is huge.
I know 19qt is fine quart wise, but what about the actual dimensions of the floor space? Measuring from the bottom she only has 13×8.5 to roam around in. Is that enough? I guess my real queston here is how much floor size do hatchlings/juveniles need, dimension wise.