Now we are ready to construct our fireplace and I am looking for a few more details. If you wouldn't mind sharing - what is the depth of the side columns at the point that is perpendicular to the wall? - how wide is the face of the fireplace and the size of the firebox? - How deep is the face of the fireplace in relation to the side columns? Also...what kind of stone is this! We are looking at using the "Rock Solid Originals" in the "Kiamichi" or the "Seneca". Your help is greatly appreciated !