So, not really knowing what I was doing, I built a chicken tractor. It works great during warm weather but, seems too small now that our Kansas winter is close at hand. Plus, the whole moving the tractor every day grew old quick. My chickens also managed to dig up one of my neighbours flower beds so free-range is now out of the question and a permanent coop with lighting and deep litter seems more appropriate. The thing is, I am out of time. I was thinking about stacking up straw bales around the outside of my tractor to help shield them from the cold. I could put a tin roof over this which would still allow adequate ventilation. My question is how dangerous is this for the chickens as far as dust and mold? I have seen several posts warning of both, but not sure what my other options are right now. Here is what I am using now.