Sump was custom made but came with the tank when i bought it, dimensions for the sump are - 47x16x16 it fits perfectly under the stand with about 1 foot infront and 1 foot in back
the return pump is a Reeflo snapper and IMO it's plenty of flow for this tank until things start growing out, but my thoughts are at that point i'd just add a Mp40 vortech or 2 of them
I'll have aquascape pictures up tomorrow of the right side, granted i still have to work on the lighting and the left side aquascape but it will give you an idea of what i'm going for
i'll get a picture of the center brace as well, it's about 3 inches wide
i changed the design a little bit and pretty much put the rockwork up against the glass on the right side, but the way i'm thinking now is that i'll slope the rockwork into the left side of the tank and leave the rock off the glass on the left side making a nice open lagoon for lps, though i'm a perfectionist so this might not end up being exactly as decrisbed, lol
i basically buily my scape to maximize growth, and sps coral placement