You might be interested in the Eglu...a plastic, collapsible, portable chicken coop/pen. :) Their site is here, it is a fun, interesting, and cute read, even if the product isn't what you are looking for.

http://www.omlet.co.uk/homepage/homepage.php

We old timers call these things Chicken Tractors, if you Google the term you'll find out more about them.

However you house your birds, make SURE they have a strong, predator-proof place to sleep at night. :)

Velvet ~:>