Whats your render times on that scenes and what are your specs?
I once made scene with curtains and it rendered about 24h. I got old PC but also maybe I did wrong render settings in vray and bad curtain material. My cpu is core2duo. 2 cores 2 threads.
Nice work. I think someone has learn a lot with Bertrand's products. Still in Strasbourg or did you move to Paris ? I m from there too .Could we meet to share some knowledge and talk about architecture designer and so on?... Cheers