I am currently planning out my little cottage tractor for some silkies. My daughter wants one for a pet but I figure we will end up with 2-3. The cottage is based off the "Hawaiian Cottage" tractor that another bycer built. I am making it 3x3x21/2. The roof will be peaked and I plan on putting it on a 21/2 foot high base with wheels. I will also be making a run that will move with the tractor. First question: Will it be big enough when they stay in it for the winter? Second: Will they need more than one nest box? Third: What size opening do they need to get through if I make an opening in the floor for them to move down to the run? Any input would be greatly appreciated!