My process has lead to the feeling that the 3D PDFs are the end game and for viewing only. The sales people gave me some guesses on which Adobe Creative Cloud software would work with the 3D PDFs - I could not find a way to load the 3D PDFs into any of the suggested software applications. So NO definitive answer probably equals - does NOT work. With regard to Tetra4D - NO answer at all from them probably equals - is not compatible with SketchUp. Thanks again for engaging me on this I will bang my head on wall until it really hurts. Having a little outside focus is a good thing.