Solar system planets and sun

My eight year old had a project in school about our solarsystem, so we decided to print out the planets according to his teachers guidelines, and made a quick design in Tinkercad using half spheres with a thickness of 2mm

You can find the instructions in Dutch in a picture, but to give a quick try in English.
Here are the diameters.

Sun 14cm
Mercury 2cm
Venus 2,4cm
Earth 3cm
Mars 2cm
Jupiter 8cm
Saturn 5cm
Uranus 4cm
Neptune 4cm
Pluto 1cm (Yes we know about that Pluto-thing)