So I have decided to get a bigger coop for my four girls after some good advice here, and found a very good price for a Little Tikes house that I'm going to pick up today and modify. I saw the awesome thread that someone put up about theirs and it was very helpful, but I am wondering about how to attach a run on to it and if it needs to be elevated. Also, would you all recommend a plywood floor or wire with pine shavings? Just trying to wade through all the info here! Thanks.