It is a little bigger. Ours stopped at the door and didn't have that extra piece after it. They are optimistic to say 6 though. I like the white colour, mine was just boring brown :-)
Just be aware with the free ranging, we did that for three years then our luck ran out and a goshawk took one of our fully grown bantams. If you are going to free range they need lots of places to hide not just open lawn.
I'm not sure what type of chooks your running, but that coop is suitable for about 4 full grown bantams, or could sleep 6, or 4 full size chooks, providing they spent most of the day outside. If your bathtubs have 2" clearance under them they make great safety spots for smaller chooks.