Sturdy  Lots of Space.  The window opens for more ventilation in addition to the 2 round screened in vents in the front  back.  The skylights on the roof ridge  window also provide light.  It came with shelves, long for the back wall and also the corners. Can lock it with your own lock. Fairly easy to put together. Did it by myself but 2 people would be better if you havent done this before. Took some time to adjust the doors, was easier when it warmed up. I would buy again.