This cattio was well built and it was easy to follow the diagram instructions.  The joints are dovetailed and the pre-drilled holes lined up where they were supposed to be.  It does take two people to hold/screw while assembling.  The material is lightweight (1x1") but once the roof panels were added it made it much more sturdy.  I bought two and put them together to create more of a square cattio which allowed room for two human sized chairs so we could spend time with my cats outdoors.  We all are enjoying it immensely.