Ordered the Silverstone Short Cable Kit:
I ended up replacing all of the cables with this kit. Some were the same size but they are much more flexible and was rest assured they are completely compatible with the PSU. I do with they were a little shorter but everything does fit nice even though it looks congested from the back.
In the above photo, a couple of stock case cables for front panel are a bit long so the extra length is tucked in the bottom right between fan and case. The rear fan made a ton of noise without the screen on it (case came with awesome screens, thanks ebay seller!). I was surprised by the sound when I rebooted without it on. Must be some weird suction from the perimeter of the fan on the case. This is the only fan that did that. But with the screen on (above photo), the case us super quiet, very happy with that. Only had to loosen up the screws on the bottom right fan because it did touch it's backing for some reason. It was only a little but the fan recognized this and shut down by it's self (thank goodness).
Again (above) you can see the large hard drive attached to the HD case bracket which is mounted directly to the back of the fan. Power and Data cables are already connected. Inside SSD and front panel SSD have connections facing up. Short cable with kit came in handy for this wiring. Really really like the 25mm rear plugs. I like to use plugs in the ports I don't use but the case comes too close to 2 of 3 Displayports and HDMI port. But I can plug into these ports with cables no problem, just need to trim my plugs a little. DVI plug fits fine. Now that I'm looking at it, wondering if I should cut the metal between the Double GPU plate (case area between GPU ports that is restricting air flow)?
Side few of the three CPU fans. The left 14mm fan is offset because of where the case mounting is. The middle 20mm fan is offset because of the wifi housing. I don't think this is an issue at all. U.2 cable probably could of been routed up and over top of case but would of been too tight for me. Going through the middle of the case left no major kinks and rode along another cable. But it is long so and difficult to get tucked in. Adding a little slack here and there helped it (under right side of CPU heat-sink and poking out top of case before cover is on).
Looking from the top, not much room for a side panel fan, the CPU triple fan setup takes up most that space. Maybe a hard drive could fit there but I already have three! When side fan and hard-drive assembly is attached, the hard-drive bracket does touch the PSU wires. You can see one (looking at top photo) below the power cord.
At first, the hard-drive bracket was bulging out but after a few assembles; mocking up locations, the cables loosen and conformed nicely. While I was worried in the beginning that the side bracket (fan/hard-drive assembly) would need extra support, I'm confident it will be fine for some time. So far I'm very happy: It started right up, booted Win 10 from usb, just need to get more drivers installed so I can get internet going. I'll have some beauty shots in a few weeks when I get the parts list together for pcPartsPicker site. Build was a lot of fun. I look forward to doing it again with REDACTED.