I don't know if this would help but BJ Shaven has a transparency tutorial at http://www.geocities.com/bjshaven/Poser11.html I don't know how you would incorporate it into your model, though. I'm clueless about such things. I'm wondering why you don't make the sidewalk more the color of the steps. It still looks a little odd, but I guess it may be regional that sidewalks I'm use to seeing are grey-white. You're really close, though. It's amazing to see how far you've progressed with this project.