I ran across this today while surfing and thought some of you might find it of interest. http://www.simplifiedbuilding.com/pvc/PoultryPen.pdf and where to get the parts. http://www.simplifiedbuilding.com/pvc_fittings.php I dont know if anyone here has tried using pvc for pen and coop design before, but it would seem to me a material that would allow construction of a lightweight tractor for mobility, yet large enough to house several birds without breaking your back everytime you need to move it. It also shouldnt take a lot of power tools to build. A good hacksaw or pvc cutter and some glue and maybe a drill and your set. Anyway, I am interested in seeing what you people can do with this construction material and I am makeing plans for myself.