We have nine nineteen-week-old pullets (four Barred Rocks, four RIRs, and one Buff Orph), and one Buff Orph roo. The currently have a ten-by-ten run (actually a dog kennel, with hardware cloth on the lower level, and a nice roof) with two dog houses for shelter, and a "nest tub" (feed tub on it's side with pine litter, and packing tape over the bottom edge to hold in litter and eggs). We're building an attached hen house. How big should it be? It will be walled with the same metal roofing that covers the run, so I expect I'll need to add foam insulation? Would fiberglass held in place with chicken wire be OK?