Since this is my friends first time I didn't expect him to hit maximum. With that said, from the pics and quality, he did a fantastic job. I have not weighed the yield, its on day 4 of drying, but I am thinking 3 oz will be the number.

Improvements...

A larger dwc tub. The root mass was not a problem, but the solution could only top 3.5 gallons max at a time. Too many refills...so a larger tub will be nice. Since winter is coming the basement will get cold. A Root matt heater will likely be needed and maybe since the temps will be lower, a few more cfl's.