I just made this a couple weeks ago. Two individual 2X3s.
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I HATE it. The bottom isn't hard to access (the middle grid swings up to open) but I hate getting down on my knees to spot clean. This weekend I am rebuilding them each a 2X3 on a stand. Takes up more room, but it's easier to clean and allows the boys to communicate (without killing each other).
It is definitely a good option if you are low on space. It's really easy to build, too. I just can't stand getting on my knees to spot clean, and having to swing open the grid to put in hay and veggies. Though you could leave that grid open, I have it on hinges because of dogs.