Revit 2017.1 Import Rhino Materials

Following on from my post about the new Revit 2017.1 feature 'Import 3D Shapes', I have done some more testing on how to import Rhino files with materials (colours) into a Revit family. If you import a Rhino file that has no colours or materials defined in it, you just get a dumb object in Revit that has no capability for controlling materials. However, one of the subtleties of the new