Have figured out the basics about how to use SBuilder vers. 2.05, for adding VTP poly roads, and it works very nicely!  However, I have a couple of things that I am struggling with, namely:  (a) does anyone know of a straightforward way to incorporate a background map - I've read the instructions and cannot figure out how to crop a section of map (taken from a screenshot directly above) to fit the working area; (b) have tried adding a bridge using the objects function, but it doesn't show up, despite adjusting it's position relative to AGL.  If anyone has some experience with this program, your input would be greatly appreciated.