First off, the design looks great! It looks very solid and secure! The first question that popped into my head though, was "Why are the coop and the run the same size?" Coop space "recommendations" is around 4 sq. ft. per bird, while run space is 10 sq. feet (unless free ranging is used amply). BUT, with your cold winters, having lots of indoor coop space will be great for your birds, in case there are days when they are inside all day.