It looks like a very good design, especially with the run extension. I had a little trouble following the directions. For example, all of a sudden there was a floor installed, without any explanation on how to do that. If you are handy with building, I'm sure it would be easy but for me, it would have left me challenged. Also, more pictures of details would have helped, like seeing a close up of the inside of the nesting boxes. Having said that, I expect I could give these directions to my husband and he could figure it all out with ease.