Did you find the bit in the original course to follow?
I found it in The Complete Blender Creator Archive(2.7) as they removed this section from Complete Blender Creator: Learn 3D Modelling for Beginners
Great dramatic scene. I think because of the lighting.
A fun section! I found the collision boxes a bit finicky, and it was difficult to get the wall to stand up until I wanted it to fall down. I like your set up!