Wonderful !
Long ago, I had made a world map in the original game. And I exported it in the definitive edition.
If you want inspiration, you can find my version of the world map in the mod section:
But I saw a lot of problems (30 textures max, civ locked in the multiplayer lobby, dark textures after visiting homecity…).
Be careful with large maps. You can find the scenario editor bug thread here:
Good luck. If you will publish your map in the mod section, i will share it in my own map description. I really like your first map rendering. 