Hi! When we purchased our home we were thrilled to have a fireplace. But, the fireplace cannot be enjoyed where it's sitting. Additions had been made to the home keeping it from being the beautiful fireplace we love. The interesting thing is that the fireplace is in the den and the wall behind the fireplace is a brick wall. My living room has 3 plaster walls and one large brick wall. The idea is to turn the fireplace into a functional source of heat in the den while the other side would not only be functional but also a focal point. How hard would this be to do and how expensive would it be?