How can I modify The Garden Ark mobile chicken coop to be larger?

Larger version of The Garden Ark mobile chicken coop built with DIY coop plans

The Garden Ark mobile chicken coop is designed to be an efficient, portable, all-in-one chicken tractor for housing a small flock of 3 or 4 standard-sized chickens. But what if you want to house a few more hens than that, yet still be able to move your chicken coop around your yard? Or what if you just want to give your small flock a little more space?

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