It finally happened...this past weekend, we began water-testing the beast. I had a few minor leaks to deal with, but nothing out of the ordinary, considering the number of holes in the tank.
When I get home this evening, I need to check the overflow for leaks in the connections, and if all is good, I'll reconnect and fire up the closed loop system to get an idea of where to aim the return jets.
We filled the tank with RO/DI so all we need to do is mix in the salt when the time comes (the rock is already dead).
PROGRESS!