Olivia,
if you base it on the ISS you will have lots of three dimensional shapes to include and a range of nice cylinders make that so much easier. Start saving the Pringles!
You could extend this to an understanding of no air in space, so spacecraft built in space don’t need to be aerodynamic, but spacecraft that get you to space do need to be.
Children could then categorise each other’s spacecraft (and you could test them on a windy day)
https://www.spaceweek.ie/wp-content/uploads/2020/03/Make-a-Space-Station.pdf