Very nice work...and no I'm not telling you to do anything different. I bought a sump premade. It had a intake chamber/section, but I had a ton of bubbles. Filled the chamber with various stuff. Finally went to a Herbie overflow and no more bubbles. Yours has mine beat. Mine was just open top, but I can see yours is a much better design and would eliminate the splash and mess. One word of caution. I would not run your carbon in it. Not only would it be quickly plugged up with all the organics from the tank, it will also get beat to death. Carbon is soft and it will just be dissolved with all the beating.