70+ gallon custom

[SteveConn]

Hmm.. can I even call this a build when the tank design is still a sticking point??

Small dilemma: The available space I have to put this tank is restricted by total weight and area free for the tank.
I figure 70-75gal is fine for the DT, maybe 15g for the refugium/sump (is that too small?). I can go as long as 48" but 42 is more likely
I had planned on 18" for depth (front to back of tank) but with an internal overflow, the builder suggests that isnt enough for proper scaping..and I should have 24"
24" is pushing it, 22" would be a max depth. Would a corner overflow solve the problem? Would it create issues with tank flow?
Height of the tank: fine with 20-22" deep..hopefully that will allow me to clean and place stuff in the tank without a problem.

Heres the equipment I already own:
Deltec 200 skimmer (hang-on, can go in sump)
1 high flow korolia (not sure what gph)
1 korolia nano
1 maxijet 900 powerhead (extra flow for sps)
1 Fluval 250 for chemical filtration
1 modular LED kit w/24 LED (12 white/12 RB 3w) + 2 3W RB for moonlight

All this is used on a 22g JBJ Nano with SPS, LPS and a few softies.

What just arrived:
Apex Pro Controller

Whats coming:
2 Vortex 40W ES
2 1.1ml/min BRS dosing pumps for Cal/Alk & Mg
1 50ml/min BRS dosing pump for water topoff
1 Tunze ATO unit
Dual GFO and Carbon reactor w/maxijet powerhead 1200 (295 gph)

Seems like I have most things I need other than the tank itself!

I think my skimmer may need an upgrade to keep pristine water for SPS, but it has to be quiet and minimal overhead needed to take skim cup off

I can get a metal cabinet made (frame) but I need siding put on that would suit easy access to the sump/skimmer...and it has to look good since its all in my main living area (2nd floor, condo)

Lastly.. I need a finished basement :-/ When that happens WOOHOO 400 gal!

Any suggestions, comments??

Thanks!