Niamh,
lovely plan, which rocket launch would you use? I do like the Starship integrated tests, particularly the first one that doesn’t work too well.
One slight physics bit of pedantry – the rocket gases push against the rocket body to make it move. “pushes down hard against the ground” – this is for people jumping, but the rocket gas is coming out of the rocket – it still works when the rocket is in the air.
If a child suggests that, you can ask them to try out what happens to the rocket balloon launched horizontally along a string. Does it move?