Those make the best coops. Just add a concrete foundation, 3/4 plywood floor (or fancier if you wish), a couple nest boxes and a ladder (all a roost bar is, is a giant ladder that holds a lot of chickens. Windows would be a nice touch. More Venting and More light better eggs. Don't forget the hardware clothIf you have no carpentry skills and have more money than skills, it's as simple as taking a delivery from Lowes for an 8x8 wooden shed with gable ventilation that you can then add nests, roosts. and additional ventilation to with minimal skill or effort.
http://www.lowes.com/Search=storage...true&Ntt=storage+sheds+wood#!&N[]=0&N[]=2z8vq
$568.10.....looks cute, you can add some windows on the side and frame them out with wood and paint them white...you can add outside access nest boxes as simply as cutting holes and inserting 5 gal. buckets and modifying the buckets for nesting. You can add a pop door easy peasy. You can add under eave venting so very easily and also some venting at the floor level. You can shop for scraps of linoleum to put on the floor to make it waterproof.
All those things can be done cheaply, in one day, and by an unskilled person.
and you could get away with 12 chickens and a rooster (if city allows).