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