Hello, this is the pece sthat I´m working now, as usual I have done it with a structure of plywood cover witha a frame of beams that are done also with plywood cut freehand, without rule, this give a irregular beams as you can see in the real houses.Spaces among beams are filled with cork.
The irregular stons are a mix of pleebes, cork dust talcum powder and white glue
cheers