New tank, Reeflo's and OM 4 ways, DSB

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Seen an other post talking OM's and Reeflo's but didn't want to hijack.

Looking for comments and some questions on my plan for my new system (145g (69.5x20x24"H) wall divider, with 75g sump and 33 ref in basement). With it, planning on SPS and possibly some clams in the future.

Tank will have overflows either side, one drilled 2-2" for sump drain and CL intake (OF tower drilled) other will have 1-2" (sump drain) and 1-11/2" (sump return).

CL is 2" intake to Reeflo Dart, OM 4 way (ver2), to 4-1" bulkheads drilled in each corner on bottom just in front of the overflows.

From the overflows, 1-2" direct to skimmer compartment (ASM G3), second 2" will tee to ref (flow controlled with gate valve) and sump. Return to tank via March 6 series pump (should be good for 1800gph).

Have my current 75g mainly FOWLR running a 4-5" DSB with 0 nitrates for about 3 years. Like to stay with a DSB on the new system but rather it remote and just 1/2-1" sand in the display. Wondering how much surface area I would need in a remote DSB to support the system?

Believe I've got a good a plan for tank, bulkheads and flow but still also need to sort out lighting. Ideally a Aqua Light Pro 72" retro kit but length is 71" and my total tank length is 69.5". Needing suggests here.

Photo is a picture from the show home but shows where I'll be putting the tank (behind the loveseat) in my place.