Hi - I'm in the process of removing the plaster/cement from the walls in the kitchen. I was planning on knocking through the chimney to create a fireplace, but it doesn't look very stable? Some of the bricks on the side are missing and soot is coming through the holes. How should I go about knocking it through - acrow props? Or should I leave it altogether as the strip of brick holding up the lintel looks really thin and in some places non-existent? Thanks.