I am planning to build a coop in my barn tomorrow. I will be utilizing an unused equipment stall under my hay loft. Two sides are solid walls (well as solid as an old barn wall can be). I plan to use a combo of plywood lower and 2x4 welded wire upper to finish the one wall and to create the door. I will be housing 4 full grown BRs to start with and housing will be only temporary for a few weeks till they are turned lose on the farm. Any ideas or suggestions are welcome. Will add pictures as I complete.