Yes this is the idea give or take... I would want to do more of a stark 1/8" drop on the layers as it will be filled with coral at some point. Also with the under lit display/logo that is interchangeable will make it a little tricky. I also am floating the idea of sinking a few monitors or tvs in the back of the tank...... We will see though as at some point I would like to own a fish lol.
I like that idea too. It'd be easier to do with acrylic too that way I imagine.
Thought of something else you could do since you're not doing sand. Basically a cave lit from under the tank.
This video shows one at about 47 seconds in. I think a cave like this for NPS corals would be really cool.