It's not a seed, just modded and changed skybox, testing a new mod a mod author gave me for testing.
What i did is to make the texture for the skybox,

Some more i created.

https://steamcommunity.com/sharedfiles/filedetails/?id=2633960214

https://steamcommunity.com/sharedfiles/filedetails/?id=2633961317

https://steamcommunity.com/sharedfiles/filedetails/?id=2633960409

https://steamcommunity.com/sharedfiles/filedetails/?id=2633961986

hopefully when he releases the mod i can share my textures :D