Biggest challenge is to change the default standard terrain shader code to tri-planar mapping. The modified shader was not perfect, but enough for me to carry on.
Used free assets to build the terrain:
Outdoor Ground Textures - http://u3d.as/5Lw
Yughues Free Ground Materials - http://u3d.as/5Tu
New Post-processing Stack (Pre-Release) - https://forum.unity3d.com/threads/new-post-processing-stack-pre-release.435581/
True Volumetric Lights - https://forum.unity3d.com/threads/true-volumetric-lights-now-open-source.390818/
Realistic Terrain Collection LITE - http://u3d.as/kgt