A trench was dug and covered with flat stones with a firebox at one end and a chimney at the other for draft.
Primitive technology tiled roof hut.
In the tiled roof hut that i built based on your design i created a small furnace with a few clay tiles laid on top for cooking on.
The hut is 2m wide and 2m long the side walls are 1m h.
Earthenware may be placed on the tiles to cook.
Next to the furnace there is a small chamber made of the same mixture as above but with a clay tile floor for not putting food on mud.
This was inspired by the korean ondol or hot stone.
Originally i fired previous pots in small pit fires.
Furnace made of mixture of mud clay and fibres.
The fired tiles were then hooked over the horizontal roof battens.
But the kiln allowed me to fire larger pots with a lower breakage rate than pit fire.