My husband owns a fiberglass company. He made a mold for a portable small livestock shelter for my goats. We had a door made for them so they could be used for transporting in a pick up bed. I have several around the farm and envision them as small portable chicken coops. I would like to breed purebred chickens and need to be able to maintain breeding groups. They measure 4' w x 6' l x 4' high. They weigh about 100 lbs. What I wonder is: should a floor be added? Or should I leave it on the ground. I've read the deep litter method is better on bare ground. Would it be better to put it on legs? I worry about the wind. How much ventilation do I need to add? How many full size chickens would be appropriate in a shelter this size? I'm thinking to add outside nest boxes to the back. I look forward to any suggestions.