How is it that the actual size is always more than the dimensions in your head. I measured the space that I had and told myself OK 4W x 5T x 8L will be enough for my 6 hens. Took a crash course in google sketchup and got to work. I started building and thought you know I have the length why not make it 10L and I might as well do 6T so that I can walk into it. After I built the wall frames and stood it up I contemplated cutting 9 inches off to bring it down and then talked myself out of it. Well the neighbor has a small arc with 2 hens and said this is really all you need just an arc, they are simple to build. The wife signed off on the arc and after $500 in materials the arc is now a 4x6x10 "storage shed" as we have told the neighbors across the street. Technically its storing something so that should be ok. Started yesterday, made 4 trips to Lowes and you know its bad when you leave something that you brought to the store on a lumber rack only to come back and find it hours later. As I built the wife kept saying Um that appears to be getting rather large, what happened to the "arc" you mentioned. Well honey Noah brought on more animals than anticipated so it grew.