I had to go all the way back to post #1 to find the reference.
I have my own design, of course. It has a general leveling (see the cut-and-fill that Geoships did). But then to mimic historical precedents it has a fire ring in the center, in a sunken conversation pit.
Except this fire ring would be
a smokeless fire pit..
The two step pit would have a sump underneath and an air tube that spirals in from the outside. When the fire pit is not in use, it can be a fan-driven earth-tempering air intake.
Any arbitrary soil sample will need amendments, usually clay or sand. A rammed earth floor can be stabilized with ox blood or rice water. Upper floor levels would be shoes off, burnished hard wood.