I made a mini tut showing how I approach integrating micro texture into hard surface props: https://www.artstation.com/artwork/sculpting-micro-texture-tutorial
There should be no hard/split edes . The displacement goes in direction of vertex normals usually . You need a bevel on hard edges and face weighted normals
You betcha! BlenderArtists is another resource or Blender Market, if hard surface is your thing: https://blendermarket.com/products/hard-surface-modeling-in-blender