Room for firebox and wiring

Continuing to work on the lower portion of the chimney, I cut out space for the firebox and any wiring I might end up running through the house. To do this, I scored lines in the foam core, and then lifted the pieces out with a putty knife. I waited until after assembling the chimney since it's far easier to cut portions out in the size and shape I want than to attempt to frame the area with thin pieces of foam core board.