This is an illuminating film. Our place is So So small..
To Scale: The Solar System from Wylie Overstreet on Vimeo.
I once helped my little sister with a project and we did this, we got the foam planet set and we strung them along a 29 ft string. Then we made a poster where each planet was a dot or circle approximating it's diameter (the sun was a 6ft wide circle so it was only shown as an arc on one border of the poster, the earth was a simple dot from a pen, barely even ranked, I think jupiter was 1.25in).
I wish I could have been in class when she showed that project.