Tomorrow we will hopefully place the siding on the new coop. Currently we have the walls up and the roof decking in place. We framed a 2x4 where the pop hole will be located and allow for a maximum 12" tall pop hole. The studs are 2' o.c. so I could potentially widen the opening, but was planning a 12x12 door opening. Once the siding goes on, it's going to be much more difficult to move the 2x4 header that limits the height and provides a location to screw down the siding. But right now it would be very easy since the framing is all accessible. Will this 12x12 size be ok?