The product arrived with two parts (#20) missing - fortunately, they were simple and I was able to make replacements.  The barrel bolts are flimsy, and I will replace those with more robust catches.  One part was broken, but I was able to glue and clamp and use.  Some of the screen components weren't marked, but I was able to get them in the right locations by process of elimination.  This would be a difficult assembly for someone without basic skills.  Once assembled, the product was sturdier than it seemed to be.  I will probably paint the exterior and reinforce some of the components - it doesn't seem to be weather friendly.  The cat seems to like it, though and that is why I gave it 4 stars rather than 3.