The toilet that was downloaded already has a 2-D representation or ‘proxie’. It’s part of a system or way to create construction documents fast from LayOut. (ConDoc by Mike Brightman designs)
If you rightclick on the toilet and choose ‘Save As’ you can save it on the desktop for instance and then open it with SketchUp.
Components are just like ‘little SketchUp models’.
There are two Tags, CONDOC_3D Objects and CONDOC_2D Graphics and they basically are used for what they are called (!)
So in Top views, one could use the 2D graphic, only. For other elevations, one could set up simular views and add groups that are tagged differently, but most often the top view is enough.
Check out this thread for another example where the use of 3d Objects only result in an un-managable model: