The whole pen took a week and around $300 to build. It is my favorite pen! It keeps the birds nice and dry and safe.
The other project we did very soon after the pen was my brooder.
I spent a few weeks researching other people's ideas on brooders and came up with this plan for mine. It has 2x2 legs that are 6 ft tall, the back is a 4x4 piece of plywood. The sides are 2x4 with the plywood on the inside for smooth lines for the chicks. The 2x2 runners are for holding the 3 shelves.