i have a huge fireplace it is 7 inches off the ground (in my basement) 48 inches wides by 29 and 24-27 inches deep i want to chisel out the brick bottom to bring it down even with my basement floor in cwhich i could put a englander 30 or some kind of woodstove in it ... putting the stove outside of the fireplace is out .. it has to go in the existing fireplace.. question can i do this (chiseling) without damaging anything?? I dont know whats under the brick I would assume its more brick then my concrete slab