Hi there,
I feel its cheaper to get the coop made from professionals. It saves you the pain of doing it all by yourself and. I got one made from metal buildings colorado and it wasn't much expensive, around $350. Also it looks great! My chickens are happy!!
Well I agree with Folly. Chicken coops really need to be secure to avoid any unpleasant sights in the morning. A year back I had a coop built in my backyard in a week. Really happy with the work! Here's one picture of it: