Your algea scrubber looks very professional and well thought in general, but since you strive for perfekt, I'm a bit surpriced that you let the emergency outlet take up so much space lengthwise. I estimate that it is about 1/4 of the length of the scrubber... My sump area is always crowded with equipment, so space is always a concern. Have you considered a more space-efficient design by for example implement the emergency outlet lengthwise on both sides of the scrubber, utilizing the space under the lights, instead of having it in one end? (Please note that this is not meant as critisism to your design).