I think when you say bigger you must mean fatter, lol. Now that they're about adult size they're not growing as much but they are becoming plumper. It's still the same setup. I haven't had a chance to upgrade and I still haven't found a nice male yet.
Here's the step by step build on that cage. If you do go ahead and build one like this I would recommend adding extra layers of tile grout since BD's like to dig.