You can try to use my implementation of the Voxels — Voxel Art Plugin, that allows you to create any worlds you want.
However, the key feature is that I am focusing on the free version at the moment (Which supports many features). The plugin has not yet been released at this time, but I plan to make a release as soon as this month.
More Info:
https://forums.unrealengine.com/comm…s-in-real-time