However, while I can manage to get the center front bitmap to work, I can't figure out how to set the further away image sizes. It seems that I can't just "invent" the width for the scaled images, since it just results in a corrupt bitmap, and my side bitmap crashed CSBwin outright!

Is there a thread or doc that explains how the values for the scaled bitmaps relate to the unscaled base one? (ie, what goes to the fields in this pic)