Thanks everybody,
As I didn't write in my first post, I'm living in France.
I wake up of my dark age 6 month ago when I was searching ideas for teaching "project planning and organisation". I found this site: http://www.lego4scrum.com/ .
I'd love the idea and go on using this technic. It was successfull.
The time I pass developping, I retrieve the enjoy of building new set of Lego or modding some set.
Since this moment I regulary bought sets, starting building a small town.
Pics will be post as soon as possible.
Christophe