Hi Pilou,

> About the Helpers and "constructions lines"
> part of the tree? a special layer ? colors? ...

Hmm, I hadn't really thought about that part yet, but I suppose it would fit in well to include them as another object listed under the special "All objects" group.


> Ps In Moi a copy of an object will be made the file size smaller?
> (like in Sketchup)

That's something called "instancing", which is not going to be part of MoI's initial grouping/organizing system. It is something that I would like to add in the future though.

- Michael