I will be getting my first coop for 6 chickens. I am looking for any and all suggestions...what do you wish you had on your first coop that you didn't know was important...what makes things easier (slide out tray or no?), walk in run or not necessary? Auto door? Solar powered lighting, how well does it really work? what did you do to keep animals from digging under...pretty much I will take any and all feedback Much appreciated!