Looking for help on a stove installation I’ll be starting soon. I have a masonry chimney with a metal heatform firebox. I want to remove the heatform, remove the stone facade, and use the enlarged space to put a wood stove (Drolet Columbia II) maybe 1/2 in and 1/2 out? My main question is: once the heatform is out, the ”firebox” would be unfinished masonry block. What can I put on that to make it 1. safe to have a woodstove inches from it, and 2. Look good?