Hey folks! one of the first coops I built I used an old cart like this I bought mine at a yard sale for 10$ build 2 boxes on the top, 2 on the middle, and 2 on the bottom, then a few boards for a walk to the top and middle. Total Cost was about 20$ I ended up building another one since we had 14 chickens. to move it all I gota do is move the walk boards and roll it wherever I need it to go. I built the 2 boxes on each level on a piece of wood, so I can lift the boxes of the cart if needed.