Well, honestly, i just always design sumps that some fuge/chaeto/whatever area comes before skimmer.
Mainly because skimmer chamber often require lower water level than rest, so, it's kinda hard to have chamber A with lower water level than chamber B....
Like this, first chamber, where overflow pipes comes in is highest, same level (or slightly lower, depending on design) is second chamber where is fuge, or even frag "tank", then skimmer chamber with lower water level, and last is return chamber with even lower water level....
Also, it's a believe from older times that fuge needs as more unfiltered water as it can get, after water passes mechanical filtration, skimmer, reactors, etc..... much things are stripped from water that is beneficial to macro algae....
Of course, downside of this arrangement is that some number of pods and "good stuff" from fuge ends up in skimmer, but, there is no way to know or count exact percentage or number, so, i don't bother myself with that thinking, at some point, every reefer comes to point where, if his system depends on stuff from fuge, he "transfer" production at some better, faster and secure level....