Thanks to all for you contributions. I still hope I will find someone with experience in this method. Thanks Will B for comment, I know scribing techniques with scribe (compass-like tool) and I've done several logs. I understand how to use the cribe though I am not scribing specialist.
The logs on the pictures above are not scribed with traditional scribing technique I think. The logs were not set one over another. They were not scribed with scribe. They were prepared separately. It is interesting how precisly is possible to transfer tenon and mortise size to irregular logs.
