Just make sure it still has good ventilation. Chicks need it too.2 sides of this brooder will be covered in plywood .A third side will have a clean out door. Its the side that attaches to the run that concerns me because the pallet run has only got hardware cloth on it and that will let too much cold air in the brooder.A window on that wall would allow the flock to see the chicks in the brooder and keep the cold air out of the brooder. I guess I'll be taking some measurements of the wall tomorrow so I can find a window that'll fit.I don't have any updated photos of the brooder since I got the sides up today.The run is on the left in this photo.