I decided that the mountains weren’t up to standards and that they looked cartoony, so I’ve updated my Heightmap and gotten it in-game once more. It took me some hours, but since I know what I’m doing now, it’s no challenge anymore. There are a few smaller LOD-problems with this version, but I can live with them. I think Bethesda themselves hid such problems behind veils of fog and other statics in their vanilla Skyrim space.
The next step with this is to create Regions. That’s how you tell the game what trees, bushes and rocks are present in a certain area of the worldspace, and you even control weather conditions and what music is played while in the region. I am not going to design the very south of the continent in this generated way though; I am going to create the south, where the settled colony is situated, entirely by hand. For that, I am also going to need other trees than vanilla can supply me with, but that’s a future problem.
So much to do, so little time!