My kiln with its 1.25 cubic meter combustion chamber is in a self-made wooden shed. Originally it was built as ankogana in Japan and then further developed in the USA as the Phoenix type at the end of the 1970s; the construction plan was published there in a specialist magazine, and a hand-drawn copy made it to the GDR in the 1980s.
In contrast to the original, my kiln is made of heavy bricks on the inside and has since been rebuilt several times because the extremely high temperatures make repairs necessary on a regular basis.
It takes 2 days to stack the kiln. I have to keep climbing inside it. It matters a lot how big the spaces are between the pots. The flame has to pass through them on its way to the chimney which is 5 meters high and creates the draught.
Every firing changes the kiln a bit, just as I probably change a bit every time and learn something new. Then the desire to start all over again always grows immediately.