You're top, mate. Giving this inexperienced reefer some hope and inspiration!Yes, main drain is left and E drain right. This was only to get the main drain on the same side as the sump intake. Otherwise the lines would need to cross each other. They are the same diameter so interchangeable.
The emergency drain goes into the middle sump chamber where my skimmer is.
Correct that narrow chamber area in the rear of the sump is now dry wasted space.
After a year, I’m still very happy with the mods. WB is a little odd in how they set it up, but with a couple mods it runs silent and trouble free.
In can post pics or help more as needed. Just let me know.
E drain into skimmer chamber makes more sense! Where do you put your heaters?
If it's not too much trouble, Would you be able to take a picture of the top of your overflow so I can see what the view of the piping in there looks like? Some internal shots of the sump would also be helpful.
Thanks so much!