Just put this ecoFlex Chicken Barn and extension pen together!  The directions were some of the best and easiest to follow that we have ever seen!  It appears to be very strong, secure and solid.  However, I agree that some extra venting will need to be added for hot summer days, OR as we did, add the extension pen and it comes with a wire roof to allow the ducks to run outdoors or retreat to their barn!  Very nice quality!