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Randy
The construction is quite unpleasant; you can make a sump on top with an overflow. There’s no need for refugiums, just a sump with bio media and a skimmer, and you can install a sterilizer. I wouldn’t take on this task without a clear action plan and an understanding of how to build it, how it will all work later, and how it can be maintained. How do you plan to equip it? It’s not clear at all. You will also need to run electricity to it, making sure the wires don’t show. You will need to find a way to access the aquarium, and you will likely have to reach the bottom somehow (to fix something or clean the algae from the glass below). You could try doing it without a sump altogether, placing the protein skimmer on top and decorating it.