I bought this pen to attach to the Extreme Hen Chicken Coop. One full side of the run can easily be removed/replaced to function as a coop attachment or independent space.  My husband and I built the entire coop/run this weekend in about 3 hours.  Overall I am very pleased with the coop/run and anticipate that it will provide enough space for my 10 growing chicks (5 Full Size, 5 Bantams).  I really appreciate the access that the run offers to the chickens - one door on the side and also half the roof opens. The wood is fairly weak but I am not intending to move the structure so I think it will last.  I am hopeful that we have otherwise protected the area where we built the coop/run as I don't think the structure would survive an attack by a dog/coyote or other substantial predator.