Good stuff. Glad it's working.Drilled a siphon break into the bottom of all my returns at the first loc line and was able to get 5 more gallons of water into the system which is a much better level for my sump while running and fixes all my air bubble issues going into the display. Now to just wait for my skimmer to finish breaking in as it's throwing off a bunch of air bubbles and the bubble catch isn't helping much between the skimmer chamber and return pump chamber in my sump. If it doesn't go completely away I may just run my skimmer at night so I don't see the bubbles.
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That being said, sorry to be that guy, but I have to ask just in case, are you confident at having that little hole being the only thing preventing your floor from getting 5 gallons of water dumped on it? I generally viewed these sort of things as extras that are nice to prevent pump off/on from leading to a bunch of bubbles, but I'd be leery of depending on it for safety. Just takes a bit of hair algae or tank sludge to plug them.
If going this route, it might be worth drilling some secondary holes and bigger ones. Also would be a great tank to have a leak sensor in.
I say this having had my previous diy frag tank setup with a dangerous amount of water in it. It worked fine, until it didn't and when I toggled the pump one time I got a gallon or two of water on my desk and dripped down onto a non-gfci power outlet. Many mistakes were made.