Many thanks Leonides!

Still working on it (it's difficult to say stop!) . Not completely happy with the postwork I've done. Render is cooking since 48 hours (6000x4000) I'll let 48h more ! I had plenty of Octane crash because of this 17gb scene on my poor 4gb graphiccard ! May be it's time to do some updgrade ! It was also interesting to learn about instancing.

This project was an idea I had a long time ago and tried several times with no luck. This time it worked better but required a few months of work ! Now I must find a new project maybe something more simple !

Last WIP (you can check the differences!):