Here is a useful tidbit from learn demo example 2.G:
You can add a StaticMeshSimulation component to a regular static mesh to inject it into the Chaos solver.
It can then be configured to be static, dynamic,sleeping, etc…
This provides a mechanism for Chaos fractured geometry to collide with regular PhysX static geometry.
Also - Should we start a new forum post dedicated to Chaos Tips and Info and leave this post for setup and configuration?