I am in southeast Ohio and am new to keeping birds of any kind. I have a 3x4 box I made of red cedar and plan on making it into a coop. I plan on having the coop sit off the ground about 15 to 18 inches and making the lower area accessible for the 3 buff Orpington hens I want. I have seen coops with slide out floors but none that have wire flooring so the droppings can fall to the ground. Is this okay on the birds feet? What size/gauge wire should I use? Will the Ohio winters be too much for them with an open floor?