Friend Armin,
In attached made a video showing the importance of the use the paper space in the architectural draw in de softwares of CAD.
Sory for my english, I'm no have people for practice.
https://app.box.com/s/yk5u3fix7ilnnxuo43c87dwwafw9cypdThe importance of having PAPER SPACE is high, as the entire drawing can be done on a single scale in MODEL SPACE, and only in paper space, we make the modifications to the scales that we need to insert in the VIEWPORTS that have been inserted.
Keeping Librecad as it currently is, we have to either scale the drawing, and with that, we will have multiple drawings of the same part in different sizes, or else we have to modify the size of the printing sheet format, so that it covers the drawings.
Even so, and especially in civil and architectural drawing and design, this will create many problems with the scales of each detail or piece that we draw.