This aesthetic depends so strongly on you having complete control over each vertex - I’d recommend using a 3D modeling tool for it. The landscape tool in UE4 does a great job, but it doesn’t expose the same level of control over individual verts that you actually need. Additionally, the landscape tool will smooth the face normals which you don’t want to do for this look so you’d have to make a custom shader to counteract that if you were to use landscapes.
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