Unreal Engine Auto Generating Mine Maps

I would like to investigate the viability to have the Unreal Engine automatically generate a 3D map of an underground mine tunnel based off a 2D overhead mine map upload with scale. I would want the wall surfaces to generate with a degree of random surface to simulate the rock walls. Texture and potentially lighting to be applied. Maybe having the ability to select a location to generate a pile of loose rocks.

Looking to discuss the complexity of something like this as I don't know how much to budget.