I reckon if the Storm takes in a huge Nuke, it should have chunks splitting, as showcased by its left and right sides.
Similar to when the wither storm produces chunks when the command block is destroyed, here should have pieces fall off the Storm.
The chest area with the command block is exposed, so we should see parts and all.

In terms of shapes of chunks, it could go from tentacle pieces to shapes other than spheres.
I know that shape chunk part is from another suggestion, but why not here, place down custom shaped chunks on the floor, during the flash bang, like when the structure generates upon the Storm falling on the floor.