My cats were very excited when it arrived. Cliffy my Lynx helped every step of the way. Trying out every new level we assembled. I have never put anything together with a Cat.  Would of had it together sooner without the extra help. I bought this to put in my cat run that is connected to the house. I needed something that would be weather proof. My thoughts on construction: I am pleased to say it holds both of my 20lb plus cats. I did anchor the bottom with tent spikes. To secure it from the weight and weather. I am pleased with the quality and price of item.
Would recommend to all feline owners.