Plumbing Questions for Large Mixed Display

[Goofy393]

Please advise on plumbing a 265 duel corner overflow mixed tank. The stand will be done in about 6 weeks and I'm planning my plumbing. Moving up from a 110 with small Fuge to a 265 (84"x24"x32") with monster Fuge.

I'm need advise on what size plumbing to use for the return and drain, as well as other suggestions.

Here's the equipment:

High-Flow Sump/Refugium (48"x21"x30") with about 40gal Fuge volume
Jaebo DC-1200 main pump (submersed) for returns
Sicce 5.0 or 3.0 (submersed) return from Hi-Flow to Fuge
Aqua Ultraviolet UV 57w
2 x Aquamaxx XL Reactor (Carbon and GFO)
Aquamaxx Cone 5 Skimmer (Internal)

Powerheads (Waterflow):
Either use current 2x MP40 and add an additional MP60 or one Gyre 170 when they come out next month (if they do)

I have attached a sketch that I found which is giving me a place to start but I'm just not sure.

What size plumbing should be used (1", 1.5", 2")?
How should I split off my returns to hit the UV and Reactors?
Should I have the UV, or anything else, coming off my Fuge return in front of the Fuge?

I have many questions so please advise on all. It'd be greatly appreciated.

Not that it matters but I don't intend to dose at this time,

The tank will be well stocked with both fish and coral.

I have Apex Pro Grade and 4xH-52's if that matters.

Thank you very much.

[Goofy393]

Bump!