Those look awesome! I wish I could do mine that way, but there are a couple of reasons I decided to go with the current design. First, I plan on having the bulky Mean Well drivers and LED controller with the lights inside the frame. Second, hanging the lights at different levels would be a problem for me because the lower lights would block the view of the upper tanks. When I do finish it, the light system will be hanging 2-3 feet below the ceiling above all three tanks (hence stronger optics for lower tanks). All wiring of power cords will go into the attic and then down into my garage. This should make it look really clean.
I should get to do a little more work on it this weekend. I'll try to post some pics of the progress then.