Thank you so much for your reply, Puybaret, and I apologize that I didn't respond sooner. The 24 sections of roof (along with the associated 24 .png textures) is definitely bloating the file size for the project, but I think that I'll continue to experiment with some other options in lieu of removing them entirely. I consider your "By the way, nice project!" comment to be high praise, and I thought that you might want to take a look at the still-shot images (that include many furnishings deleted from the virtual-3D file) that I set to music in a slideshow on the https://www.youtube.com/watch?v=55gIsRRII30 page. Thanks again for your software--and your feedback!