Is it possible to have real orthogonal views in SketchUp?
Yes you can set up orthogonal views in SketchUp. Set the Camera to Parallel Projection and select the appropriate standard view. If you want a 3-view sort of thing in a single scene, you can make additional copies of the model and rotate them as needed.
There was a tutorial a few years ago that showed how to easily set up for isometric views, too. You can see it here