How to make modular destructible buildings?

Hello.
I know this video very well. I’ve watched it many times.
However, this is a model that has been pre-assembled in Blender, imported as individual meshes, and then fractured, which is a little different from what I want to do.
What I want to do is to fracture modular pieces, like the 400x400 Wall that comes with the starter content, and then combine them later to create a building.