Quoting you from another thread:
As a “wannabe an architect”, you really should be using SketchUp Pro. And with SketchUp Pro comes the companion program: Layout - designed specifically to (among other things) make it easy to create 2D views of 3D objects created in Sketchup.
Seems to me that using the SketchUp/Layout combination would let you not have to “smash” the walls back to 2D!