I know you have real concerns about your building skills and available tools, but you might want to look into "hoop coops". They are cheap, they are easy to construct, and require a minimum of tools. A hammer, a pair of decent pliers, and a hack saw at bare minimum.
The biggest problem most even not handy people have with them is getting the 16' panels home to start bending them into shape.
The biggest problem most even not handy people have with them is getting the 16' panels home to start bending them into shape.