The ceiling started going in, with a vapor barrier above it (which is really just a bit of a drip stopper plan). Those are cedar fence boards from the lumber yard.
As the roof was getting done, I started prepping for the cement board and heat shield installation, and thought I'd throw a little more heat shielding onto the studs:
Here's the cement board - my 'non-flammable material', layer 1:
Ceiling got done. Later got a piece of trim at the ridge line.
A round wood post went in to hold up the center of the 'high bench' so it can take a lot of weight:
And after the corrugated metal went in (non-flammable material, layer 2) I set down an old piece of granite counter top and got the little stove in.
Now to go get the chimney parts, and figure out how I'm going to cut a chimney hole.