I think it's kind of a cool idea. I wouldn't personally do it, but just because with my luck it'd fall and crash and I'd lose everything including all my fish that were sleeping under it at the time of disaster.
I do think it's kind of funny all these naturalist comments: you don't see that in nature like that, why would I want it in my tank?
How many of us have a true biotope? We combine different corals from different zones and countries, we add color morphs not found in the wild, we put fish in from different parts of the ocean, and we leave certain fish out that would naturally be found in the area our other livestock is from because we want peace and tranquility.
I say, do your tank how you want. It's there to make you happy, no one else.