Assembly directions are picture only, I only put one non critical piece in backwards - about two hours to assemble. Cat # 1 immediately claimed the inside shelter, #1 & #2 cats like the open patio, #3 prefers the roof!  #4 doesn't even want to go outside. The pictured cats seem a little small compared to mine, only 1 fits per level at a time. Very sturdy except inside floor didn't fit tight, so made a thin foam cushion to go in there. The steps are curved, you can see how nice they are in the picture. Very happy with this kit.