Most excellent work! I had found myself considering whether I'd want to try an Edge 12G as a marine tank, and was wondering exactly how to go about doing exactly what you've just demonstrated here! With the 12G at least I wouldn't be facing the same limitation on light spread.
Mind us asking the cost? And mind telling us how much you'll sell retrofit kits for?
Now, sorting reef tank filtration properly would be a different sort of PITA however...