Hej,
My original idea was to make biomes for nauvis, each looking the same as the different planets. I actually wrote almost most of the mod (there is a version of it on the mod forum if you wanna try it)....but some features were a bit too much for me :) so I opted for this easier approach, although I might give it another try eventually.
I will try to add settings option to choose if the other planets are removed, and will definitely start to add more space-age features in.
I fixed the soil placement, now the artificial soil can be placed in water, while the overgrowth soil can be placed in grass tiles. I think it would be a bit unbalanced if placement was completely free.
And by the way, you know the mod called "Naufulglebunusilo"? I like its conception, but there is something that I didn't like - the fact that all biomes are very close to each other makes it very difficult to do anything. To be honest, it would be very interesting for me to see a mod where Naveus is divided into regions-planets, but at the same time there is the possibility of flying to other planets.