Any updates on the tank?. I just purchased a 24X24X30 74 gallon reef ready. Painted the back and am working on the stand and top that I purchased. I currently have a 20X20X20 self contained cube that I plan to shut down and move the contents after some home renovations (probably January 2017). I found an acrylic two section sump that I can fit in my stand.
I currently have an AI prime on my 34 gallon. I think I am going to get a Hydra 26 and place at a 45 degree angle in front of the over flow and mount the Prime toward the front corner. The plan is to aquascape somewhat like you have yours with a tower by the overflow and an "island toward the front opposite corner.
I can start a thread with my build as I get going.