Oh man, you just threw another gurgle elimination device at me lol. Looks like I still have more research to do lol. this one looks complicated too.
I think I'll just overengineer and avoid the dado joints which seem like they will take more time to do compared to just slapping on extra vertical support.
Is a refugium necessary on a planted tank though? I think I read something in a thread about if you have a super high light in the sump or an HOB, the algae will grow there and not in the main tank. not sure if it was definitively proven though
The dadoes really take but a few minutes to cut. Even with a circ saw. Done right they not only look better but cut down on weight and wood. It's a simple repetitive cut. I make the kerfs 1/4" apart hamer the waste out clean up the bottom with a sharp chisel. If you have a router it's even faster.