Ok so I'm pretty much done with my set up. I avoided the urge to ask any questions and put in a ton of research.
This is what I came up with.
I have a 4'x2'x4' flower tent and 18"x30"x3' veg tent. Just didn't have the height to go any taller.
I'll be using 4 - 16"x24"x8" 10 gallon rubbermaid...