After laying out the multitude of pieces, this was fairly easy to assemble by following the numbers.  No tools needed.  My hens went right in the first night after breaking down their old coop and replacing it with the Chicken Barn.  However, the enclosed perch was flimsy and way to small for full sized hen feet.  I substituted a 1" heavy square wood dowl placed on wood blocks and they were quite satisfied.  Here in CA in full summer heat, the plastic boards do warp somewhat so I simply reverse the plank surfaces as needed and it has worked fine.  The Barn is well vented with the front ramp left open all the time and I think it will be snug in winter.  The biggest plus is the ease of cleaning; the roof panels can be removed to allow easy access for cleaning, which was why I replaced the old coop.