We have updated our recall pen and built a new updated model. This one is a little taller to accommodate a 5 gallon water fount and feeder to make maintenance a little easier. We used 6-7 2X4 studs and ripped them down to nice straight 2×2′s. Also, this new design uses only one sheet of 1/2″ plywood due to the smaller shelter in the back. The new shelter is only 18-24 inches wide and has a platform for roosting. They seem to like this better.