Well, I got the ducting figured out. It's not pretty but it should work. The hood is gonna be in a fixed position, but that shouldn't affect anything.
Set up the buckets, put in the Uniseals, and ran all the pipes. I let it sit full overnight and NO LEAKS!!
Added a valve on the bottom of the res for easy draining.
Here's the setup in each of the 4 growing buckets. 2 elbows feed water, and 1 feeds a large air stone. There is a paint screener to prevent roots from growing into the drain pipe.
Added insulation to the outside of the buckets. Blocks light from the water, and should keep it a little cooler.
My first distribution manifold. It leaked like crazy.
So here's the new manifold. It leaks, but less. Might be from the high pressure of the pump (using a 400gph pump right now).
Here's the buckets full with water, and the air stone on. Pretty decent airflow.