220 upgrade

[RandU]

hey everyone,
So my current set up is a 92g corner. I finally built the stand for my 220 and want to start my transfer process. Originally I was going to do a sump in my basement but have changed my mind. I attached a picture of my plans for the sump and fuge. How do they look? Am I missing anything. Thanks.
I do plan to keep my mixing station downstairs and plumb the line from that into the return line. Thanks

 

[RandU]

The part I’m most confused about is dual over flows. I have never had dual before