Very sleek sump. And I have the same skimmer. Works great and my friend who uses the same one on his 300 gallon tank has had it for 8 years and still works great. Well it can overflow or build up a lot of foam. Using a left over lid from a jar would help.
Usual order is: filter sock, protein skimmer, refugium, then return. You can always switch the order, but having the skimmer before the refugium makes it so that it doesn't suck up all the pods
that will flow over to the next chamber.
I have 2 overflows, but one is used for emergency. Depends how you want to plumb it.