I have/will have six chickens and a duck. I am wondering how big my coop and run should be to comfortably accomodate them. I want to build for at least double what I have now, but, I'm trying to figure out what I need now so that I can figure out what "double" is. Also, any tips on what I could use as the duck's swimming area? I was thinking a horse trough, but, someone (smart) mentioned that would probably be too tall for ducky to get in and out of easily.