this was a huge undertaking putting it together.  The only problem was attaching the top.  The holes did not align with the supporting piece on one side of the unit.  Other than the 2 screws it came together.  My only other complaint is this is not fit for 2 medium sized dogs.  It barely holds my 43 pound mini bull terrier.  He can lay in it, but it is tight.  So, if you are thinking of getting one of these furniture crates up size to the biggest size you can unless you have a small dog.