Thanks! That certainly helped!
Is there any way to create a tunnel at a certain location? And random small caves / dents in a certain biome?
I've checked out https://forums.voxelfarm.com/post/minecraft-like-terrain-generation-possible-8170416 but that crashes when I try to add that layer, and it also looks like it won't create what I need
(Note: I'm using the SDK so if I need to use C++ to create what I need, then that's OK too)