Backyard Chickens website is full of fabulous projects and articles about chickens of all ages.

I have to say this is a fabulous chicken coop but you could almost use this design with a few modifications to build a greenhouse. 

Click here to view how to make this project:

http://www.backyardchickens.com/a/permanent-hoop-coop-guide

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Chickens In Your Backyard: A Beginner’s Guide

The Small-Scale Poultry Flock: An All-Natural Approach to Raising Chickens and Other Fowl for Home and Market Growers–With information on building … feed, and working with poultry in the garden

Free-Range Chicken Gardens: How to Create a Beautiful, Chicken-Friendly Yard

Wood Chicken Coop Rabbit Hen House Nest Huge Run Backyard Poultry Cage

5×6 Prefab Chicken Coop KIT – Eastern US

Ware Manufacturing Premium Plus Chick-N-Villa Chicken Villa