That will work fine for a hen house.
Screen the open area at the top to allow airflow for spring thru fall, make doors on hinges to close it up in the wintertime. Don't close it up tight though, you still need air transfer or the chickens can die from the built up fumes from the manure.
Screen off the bottom to allow a run for the chickens where they are safe from predators. Also on the inside of that area, build a ramp to allow the chickens to walk up into the coop.
On one of the sides you need to build nesting boxes. It's best to add them to the outside of the hen house with a roof that opens so you can get the eggs out and change the bedding material easily. It will also make it darker in the laying area which the hens like, and will curb the tendency for the hens to eat their own eggs.
There's a wealth of info here: http://www.backyardchickens.com/
Good luck, Don.