How to add Displacement Map to Cliffs

[edb3_16]

Hi, I have been having some issues trying to figure out how to correctly add displacement maps, and textures, on the verticals cliffs. I am trying to add textures and displacement and have it projected correctly on the vertical cliffs (projection like the Tri-planner projection). Anyone know of how I can set this up?
Thank you

[Dune]

You need a compute terrain for the major cliffs, and after that you can add lateral displacements by redirect (XZ, using displacement power fractals), or vector displacement shader with color/greys as input. The smaller you make the patch size of the compute terrain, the sharper/more defined the laterals can be. A compute normal can also be used. 
I made you a 2 minute sample. You can play with the order of stuff and masks and such.