I wanted to add an update of my build in prototype #2 of the S700. Below are some pictures where the build stands now. I'm waiting on a ball valve to arrive before I can test the loop, but I'm very pleased with how it turned out. I have not tested the motherboard yet as it is a return from an RMA to Supermicro. I hope I don't have any problems with it - should have tested before putting it in the build. I'm fairly confident though that it's going to be fine. All the parts were assembled and working with the previous board but due to a bent pin one of the DIMMs was non-functional.
I'm very proud of the number of cables I've been able to manage in this build. I bought 16 aftermarket RGB memory heatsink kits and had to shorten the cables for each one and re-solder them to the LED strips. Then I made a bus for connections using breadboard. These are the many connections you see either near the IO plate or near the top-right bank of memory, or just below the bottom memory banks.
I'm hoping to have this build completed before the S402 prototype arrives (probably week of Jan 13th). If so, it would free me up to migrate my current workstation to this new one while I work on testing fitment of the S402 with parts I recently purchased (along with a series of heatsink tests).
I'm finalizing the pump and wiring on the other side as the pump has different RGB connectors than everything else in the case. That side will need some further attention once I figure out how to adapt the pump to work with my LED controller. During testing of the pump LEDs, I plugged in the molex-wall adapter and had it on for a long time yesterday without realizing that the pump was running empty for a long time. I hope I didn't damage it but even so, I have a spare (non-RGB) that I can swap out if need be.
Edit: I wanted to also mention that I had to drill holes in the left waterblock so I could mount it 180-degrees from stock configuration. For some reason, these Bykski blocks don't allow you to mount them in either direction. I also purchased some RayStorm Neo blocks but then realized they were too tall for the 16mm hard line fittings to clear the side panels so I went back to these. Lessons learned for any future revisions of this case (I need more vertical clearance for the waterblock hardware).