I did this with UDK not with UE4 yet. You should be able to use a random node that leads to a variety of choices. You could place the various doors or debris in the places needed, and then the randomizer would decide which is on, everything starts off. You might use matinee to animate things, open or closed depending on a random choice, i’ve this. I’ve used Matinee to take one object and animate it in different positions based on a random choice. I’m sure there are other ways to do this.