I wish SketchUp didn't grayed the scale option when exporting PDF when I am in axonometric view. I cannot understand the logic in standart views to be able to export easily in scale but when you look the model from a different angle the scale option to be in gray. Now if I have more complex model (with more than 6 sides ) I have to rotate it to the global directions every time I want to project it from different angle. An other option is to change the page size (which is not grayed) until the scale on the right gets right . I think this is may be the easiest wish to be realized, so I really hope this will be done any time soon.