Just terraforming a creative world that orbits around a high-density planet (presumably biitula or circa) and picks out the flattest biomes possible. Then cover it with iron and make it look like the death star!
If someone did this I would be so happy. I’d be fine with doing it myself on a creative
You don’t really have to level it, just make the topmost block be the color you want to show. The worlds shown in the sky are based on a flat top-down color map view thing like the map dumps.