This is my 6" build so far. I will for sure have it running by Sunday as it's supposed to get a little chilly here by then.
Just finished the core, put the steel cover over to measure clearances. Didn't like the idea of having a 55-gallon drum inside my small home, so got a 4x6 ft sheet of 20 gauge and bent it twice using a brake I built from a YT video. Actually bent it 90 degrees and then formed a prism, thereby making the sides rounded instead of straight & flat.
It's a work in progress, just like my home.
Another view of the tower/rounded prism/cover thingie
Had an idea to make extensive use of clay bricks for uniformity in supporting the rounded prism. Will clay slip the bricks, then will put the cutout sheet metal over, then prism on top.
Wider angle view
Overhead of the unfinished core