I have the book, love the concept, and have settled on 10 x 16 size. But I have a few questions. First, why is it suggested to have a screen on the monitor windows that opens inward? Second, anyone using the dirt floor with deep litter method? How's it working? I'm thinking it would provide a bit of heat for winter. I don't want to heat it (remember the Spring fire in Colorado? We're about 20 miles from where it was) and I don't want my future birds to suffer. Any comments on flooring welcome! Third, what have you used for siding, and did you paint or use whitewash, or anything to control mites, inside or out, etc? Thanks, one and all!