in the layout you have viewports which can show different views of the model. paperspace (layout) is "2D" and what will be on the paper coming out of the printer (if you get me lol), modelspace is "3D" and as you said where you edit your model. the scale factor you refer to is just because its going into a viewport, you change the scale by typing mvsetup, choosing scale viewports, selecting it or them, and then whatever scale is appropriate. of course you can resize your viewports too . hope thats of some help and wasnt too complicated!!