Shari said:+1 to everything everyone else has said about this chimney!
By the way - can you shoot us a picture of where the stove is sitting so we can have a look see of that area?
Morning rush here, will try and get the camera out in a few, but it's nothing special. Stove is sitting on a 2 pieces of cement-board, fused by furnace cement, bounded on the edges by pine strips. Manual simply calls for non combustible surface, and we paid particular attention to the set-backs when making the board.
Thanks everyone for all of your help! So glad I decided to come and ask.