Reeftank: regarding the sump layout it is all planned by and installed by my LFS whom I had known for over ten years. Plumbing is extremely neat and none will be visible to the viewer once he is done with the install and cabinet and rebuild of the walls...
Sump setup is something like this.
Four compartment: Left & Right compartments are returns from each of the 65g tanks that are on either side of the sump (frag tank & a refuge tank). Water flows over filter material sitting on a raised egg-crate. Back compartment has four returns from the main tank and a feed return from the skimmer into which drips my doser/chemical my Kalk my CR etc all located in the closet at the end of the tank. Front sump compartment houses the four pumps. Two for main tank one for the two 65g and forth for the skimmer.. Hope that with the pictures on previous pages helps...