Hi Orache,
I must say that I thoroughly enjoyed your illustration! 
I do get what you mean as well.
To have that kind of complexity in your destruction you will need to download Nvidia PhsyX Labs for destruction.](https://developer.nvidia.com/apex-destruction) You’ll also need to register on their site (it’s free!) to download the standalone application or the plugin for Max/Maya.
To create the kind of destrution you want you’ll really need to use this software to create different depth destruction layers. Any destructible created in Unreal Engine 4 only has one depth layer. Depth 0 is no destruction and depth 1 is destroyed.
PhysX Labs will allow you to create multiple layers so you can control the destruction like you want. They’re tutorial series is fairly clear at explaining how to setup layers for destruction. If you have any questions or get stuck feel free to ask any questions!
Tim