This A Frame tractor  is designed for 3 to 6 chickens.  The footprint is six feet by four feet, for a total of 24 square feet.  I built it without a plan.  It's pretty simple, and is roughly based on similar designs to what I've seen on BYC.  Cost to build was about $80.  I already had the shingles and a bit of scrap wood on hand, which helped to keep the cost down.  It has a large door on one side of the A, and an egg door on the other side.  The wheels are 5 inch (solid), and are bolted to the back 2x4.  To move it, you lift up the front end by the handles, and lift it like a wheel barrow. It's too big of a reach for one child to move, but an adult can do it alone with a little bit of work.  The enclosed roosting area is about a foot off the ground, and is roughly 2.5 feet by 3 feet.
 
 
 
The pullets at work...
	
		
			
		
		
	
					
					
						
	
		
	
					
					
										
					
					
						
							
							
						
					
					
					
					The pullets at work...