I did this one a couple years ago. It is only procedural. I did it with the layer option in the material.
Its like 6 or 7 different noise layered and I used Fall Off to get the coastline.
The little cities are also noise but on a seperate material layered over the first one. You can get about 50% closer before you start seeing the lack of detail…. if I remember right. It was also made for a wind turbine visualization.
Both shapes need to be one spline.
1. Draw a shape
2. Draw the hole
3. High light both splines and make them editable. (press C)
4. In the object manager (top right default) Right click and find “Connect and delete”
5. Place in extrude nurbs
You need to Merge them into a scene file. Other than that should go smooth.
The mesh will most likely by triangulated too. So it may require some clean up.
/randy
If they are small scenes I would just set them in the same project and place each scene in a NULL object. Then you can turn on and off each NULL. This way you can use the same texture across them all.
/Randy