Help with new 190 gal build

[coralor]

I am having a new custom tank built (Peninsula style) with the dimensions 58" L, 34" W and 22" deep.
I'd like an internal overflow on the one 34" end that sits against the wall and wonder if anyone has any advice on that please? In particular, should I incorporate 2 drains or 2 returns, or is one of each enough?
It will be a primarily SPS dominated tank that is well stocked both with fish and corals. I am not sure which powerheads I will use, but I do like the idea of one on each side of the overflow.
Also looking for advice on a DIY sump. The DT and sump are one above the other upstairs separating our dining room from the living room so as quiet a setup as possible with excellent flow, of course, is what I'm aiming for.
Thanks very much in advance!