Hello, I have a couple of questions before i begin construction. -concrete floor or raised wooden floor? And, would it be benificial to cover the wooden floor with galvanized sheet metal? -I want to collect the rain water from the roof for watering the garden, is it safe to give the the rain water to the chickens? -Is it neccesary to insulate the walls and ceiling? (i live in michigan, a couple of weeks ago it was -10 degrees with a windchill of -30) I'm very excited and can't wait for the snow to melt so I can begin!!!!