In cad-world it is the the normal procedure to draw in real life sizes. Scaling then indeed is a matter of the printing process. Still you have to consider the intended scale while drawing, because text size and other values of the dimensioning will be scaled too. Some cad-programs take care of this automatically, but then want to be told the scale when drawing.
I think we should offer a set of templates for different scales, purposes, units and paper sizes. This could be within the program itself or in a repo.
It is hard to say what would be the best default scale option, depends on what you draw. Maybe 1:1 for mechanical parts, 1:100 for architecture. As mechanical probably is the most LC use case, I would take choose 1:1.
I would lead the user via print preview always.

dellus  

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