Progress,  page 100
I bought a heavy gauge steel damper assembly and designed the firebox to match it.
Here's the first layer of firebrick.  Normally, firebrick is laid on edge for cost efficiency, but I
was more concerned about long term strength and durability so I laid it flat.
All the texts in fireplace design recommend the Rumford dimensions (tall, shallow firebox with
angled sides and straight back), but I think it's ugly and I tried to come up with a hybrid
configuration.  I stayed with angled sides, but I went with a deeper firebox and an S-shaped curved
back to better direct radiant heat outward into the room while still facilitaing laminar air flow.  It
made a nice looking firebox, but it involved some pretty complex cutting with the wet saw.