It's a bit tight on coop space but if you don't have more than 2 chickens, you'll probably be ok. If you go this route, you'll want to figure out a way of anchoring it at night so digging predators can't get inside.
As an almost free alternative to the coop, you might want to check into pallet coops. Pallets are free at some places (we get them at a hardware store) and with a bit of hardware and elbow grease, you can make a bigger coop.
Good luck to you, whichever way you go, I hope it works out well for you!