I thought some might be interested in this. Plywood template at top is the second floor fireplace layout. I have a bunch of these to build at this job, so I'll keep it updated.

I think this is an awesome idea.:thumbsup:We decided to panelize the fireboxes, as we had seven vertical herringbone boxes to build. I believe we are going to get a better result, and faster this way.
Two fireboxes in place, smoke chambers etc. today.:clap: