just set up the cage for 2 male rats.  It took me about 1 hr to put together.  The instructions were easy to follow  but I would suggest having a second person to help.  It's very sturdy and looks great and I love the double front opening doors.  We will be using fleece and littler training the ratites so the shallow pan is not an issue.  If we get more rat I will get the extension.  Wayfair delivered it 2 days after I ordered it.  The outer package was a little damaged but nothing inside was.  Recommend to any rat owner/small animal owner.