So I finished up some details on the plumbing that I didn't get done last time. Here's the return line plumbed.
Here's the ball valve for the bypass in case I needed to throttle back the return pump. In the end I didn't need to open it at all but it might come in handy. It simply dumps the return back into the skimmer section.
I also decided to add a gate valve to the fuge line.
And away we go! .. with fingers crossed..
Thankfully the tank held water. The stand did not collapse, or bow for that matter. The overflow box took the overflow and the standpipe drains drained!
Here they are, draining, herbie style.

..
The main drain doing its thing.
And the fuge drain..
