This literally took me about 20 minutes to make, so I'm sorry the background doesn't look epic. Here's how it works: A semi-solar module is put at immense compression on top of a group of asteroids. The asteroids, because of the heat, would become magma. The magma will host the "crust", which is a heat-resistant metal (Lubicite) sheets, which act as tectonic plates. Cities are then placed onto said metal plates. A docking and armament ring is put around the planet to help defend it, as well as make Neutron have a permit when living at the artificial planet. Eventually, because the building of artificial planets is resource consuming, the Neutron ceased to build them, and even recycled some.