Well I made some more progress.
The plumbing is done and water tested, everything is good to go. I had one small leak at the outlet of the return pump, turns out I forgot to tighten it past hand tight. Snugged it up, and now I'm golden.
Here are a few shots of the final result.
Shots of the overflow box in action:
A bit of a panned out shot:
And from the other side: Coast to Coast baby!
A quick shot of the standpipes
The overflow and the returns. The loc lines are nice because I put individual ball valves on each one to help with finetuning flow depending on what corals are in which areas of the tank.
The power of the pump (x4 outlets ... its deadly flow for a return pump)
And the sump as it is right now. More equipment to come, this is just to get everything started.