Ordered the tank, starfire 48.5"x24.5"x13" and it will arrive in a couple of weeks. I also started the stand, using blue insulation foam I cut out each piece to form naturalistic rock towers that will be used to mimic sandstone/limestone pillars. It will almost seem like the tank is just sitting on top of the millions of years of coral below it. This technique is commonly used in vivarium backgrounds, I just scaled it up. The pictures are bad, but it will be covered in grout where the rockwork is and sealed then painted for the rock color highlights. The flat white panels which are part of the fake doors will be covered in silver leaf.
This is just the 'bulk' of the foam rockwork, now I will remove pieces with a hot wire to get more relief and deepen the shapes so they will still show well after a few layers of grout. I also will be adding a top deck around the back against the wall, this will serve to encapsulate the aquarium in a mountainous looking bowl and serve as a cool background when looking through the glass. I will be placing crushed fire glass between the aquarium and the border on the top of the stand.