This is kinda what I am thinking about building. I may put windows or something in the side, so that in the heat of summer I can get additional airflow. I like this design for several reasons, one being that I can easily put a tarp or some cover over the front if we get some hard blowing sleet/snow. I also like that this setup is kinda "modular" and allows for a great deal of flexibility.
http://www.youtube.com/watch?v=XjNELzoM ... ll&list=WL
http://www.youtube.com/watch?v=XjNELzoM ... ll&list=WL