Emma,
if you do include the solar system to scale, you might adapt from this Space Week Ireland resource:
https://www.spaceweek.ie/wp-content/uploads/2017/07/Classroom-Resource-Booklet-Our-Solar-System.pdf
or from the club activity The Solar System Walk: https://www.spaceweek.ie/wp-content/uploads/2020/08/Solar-System-Walk.pdf
I have taken groups for walks, counting out each step and sharing our favourite planet facts when we reach the required distance. We have place planet pictures on sticks so that we could look back and see where they are.
You could also share this interactive that maps the orbits of the planets (you can choose the scale) to really bring home how close the inner planets are to the Sun and how much further away the outer planets are.
