Jan, why not trying to program your idea in Java from a plug-in? You would have no need to generate a SH3D file, just have to call Sweet Home 3D API.

Thanks for the reply.

Using Java and the SweetHome3D API, I am able to create a home programatically and save it, so basically what I was looking for, thanks for the tip.

Still maybe I will play with the possibility to use Python but it is a secondary problem, left for my leisure time.

Thanks
Jan