220 gallon shallow build

[Prariecanuck]

I'm planning on ordering my glass next week I'm still trying to figure out my dimensions and now I'm leaning towards 96long 30wide and 18 high. So now I gotta figure out my drains and returns. I'm thinking one 30inch side to be the overflow the whole thing and two returns drilled in the bottom on the opposite side. For the flow I want I'm thinking 2 two inch drains and two 1 1/2 returns. Also there will be a 90 gallon display refugium then a 40 gallon ish sump. Ill be building the sump as well so any suggestions on sump dimensions would be great i still want a refugium area in the sump for less eye pleasing macro algae
Thanks