BB,
I was thinking 4-6" diameter inline duct fans for the exhaust. I still need to find a suitable tray, one that would be around 4' by 2'. I'll check out the local hydro stores and will also look for large rubbermaid tubs that I could modify. Once I get that, I'll finalize the dimensions for the cab and begin construction.

With the 4x2 area, I hope to scrog 2 plants to fill 2x2' of screen each. That should yeild enough to keep me smoked up until the next crop. Any recommendations for an easy to grow strain that takes well to screening?

I do have a pH meter since I have had aquariums basically all my life. I will need to pick up a TDS meter to read dissolved solids.