Messed around with how to make a destruction effect for when they break, tried two methods;
The flat panel guys are a prefab that's all the individual pieces as game objects with colliders.
For the bigger boxes I split the actual mesh into individual pieces and then added a bone to each one, then in ModelDoc added physics shapes and used ModelPhysics.
I might prefer the first approach I used since it was quicker to implement and working in ModelDoc is always a pita.
(poor quality video)



























