My DH put up a large run last weekend for our chickens, but it just isn't quite right. I have been reading different posts that suggest Hardware Cloth, we just used Chicken Wire. It is about 30'x30' and 6' tall. He used large treated posts (3x3 maybe) for the corners and then put field fence posts between the large corner posts. But it is just flimsy. Not tight at all. I think it needs more posts or framing or something. What is the best way to construct a run?