I have made a small prototype of a 3D topographical model and have projected on it with overviews of our forested watershed in northwest Sonoma County, California - Gualalariver.org
The product worked great, being a much better surface than the raw white PVC that I used for the model. It will be used in fund raising for the final 4x6' version to be used by our non-profit in a local visitor center. Great product!