text: You could use the old school approach- use mono filament line, such as super-thin clear fishing line. Experiment with the film angles and lighting to get decent footage where the lines are not visible. That's how they did it for decades, not only in stop motion, but live action films (see just about any 1950s Grade-B sci-fi/horror/alien invasion film to see how NOT to do it, where the lines are completely visible) Digital editing is a nice idea, but it kind of does away with the whole idea of stop motion- if you can digitally manipulate the back ground, why stop there? why not just digitally manipulate all the action as well?