[Cob] interior wall ?

[jimmy carlisle]

I have read most of the cob books out there and still can;t find a answer to my question on interior walls.  Maybe I am overthinking it and making it harder than it need be.  My question is on the interior walls, non load bearing, do you build after the final floor is done or does it need to be on semi foundation similair to the outside main walls.  Mainly I am wondering if I need to do the trence and rock foundation for each interior wall or do I just build once I finish the interior floors.
    thanks