We are going to build a coop next spring. Live in Northern WI. We plan on having 14-20 hens and 2-3 roosters. What should we do?? What did you do that you wish you hadn't?? Or what didn't you do that you wish you had?? What changes would you make if you had it to do over again with designing and building your coop? To insulate or not? To have a window or not? How many nest spots? Storage??