I have 5 ducks. 2 Rouen, 2 Indian Runners, and 1 Pekin. They're 3 weeks old right now and I'll be starting to build their house soon. I have the materials and plans for doors, windows, etc. But how big does it need to be? They'll only be in the house to sleep at night. Also, what size should their egg boxes be? And should I have 4 egg boxes for 4 girls? I'm just trying to get all my measurements before I start trying to build it. It will be movable (kind of like a chicken tractor) so the lighter, the better.