closed loop and overflow placement

[IHfarmboy75]

I am setting up a 135 gallon tank and am brand new to salt. I have been doing alot of research on closed loop systems and overflows but I am having difficulty on figuring out location. I am going to be using a 1500gph overflow from gl*******s.com and my closed loop is going to be a single system pushing around 1800 gph. I am thinking I should give it two -1 1/2" intakes and four returns with a scwd valve pushing two at a time. I am going to drill the overflow, and intakes but the returns from the closed loop and the sump I am thinking of just doing over the top as my canopy will hide them.
Should the overflow box go in the center or in one of the corners?
Where should the intakes for the closed loop go? Anyone have pics of their setup or suggestions? Concerns?

[IHfarmboy75]

*shameless bump* but seriously, does anyone have pics of their closed loop system or recommendations for where to put the overflow and closed lop intakes?