Bit of a lazy update here. I added the PSU and short cable kit and USB adapter last night, but I was super tired at the time so I didn't post them or give it a super effort (knowing I'll be pulling the mobo out to put a cooler backplate on on Monday anyway).
Pic album update: http://imgur.com/a/xwy4z
I'm REALLY happy at how well the ST85F-G and PP05 cables work with this case. The 24 pin mobo cable is almost the perfect length and will tie down nicely. The 8 pin CPU cable was literally PERFECT (see the pic of it running down the side of the case)! I'm very glad I got the PP05 kit. I can't imagine doing this with full length cables *barf*. I need to keep talking myself out of doing individual sleeving for these cables. Yeah, it would look nice, but the time/money involved *shudder*. We'll see what happens.
Sadly the USB 3.0 cables on the case, with the adapter (rather stiff), wasn't long enough to run down the HDD compartment side and back to the mobo through the cable management hole, so I'll be running them down the top edge of the mobo and tying it down at various points.
I'm considering using a pair of PWM 80mm fans on the bottom at low speed/noise to blow air straight up onto the GPU instead of using the single 120mm on the angled bracket. I'll try it out with a couple different 120mm fans first though and decide what to do. I'm interested in any input, but I've already considered the following:
1 - The difference in amount of airflow between 80mm and 120mm fans is made up for by having 2 80mm fans instead of 1.
2 - The potential for more noise with 80mm fans is taken care of by the fact that they are PWM fans and/or controllable by the connector they're plugged into on the motherboard. So I can cap their rotational speed to a level that suits me either way.
3 - Additionally the 2 80mm fans would be mounted to the bottom of the case so they would be blowing straight up instead of the 120mm on the bracket that is angled into the PSU housing. The angle of the 120mm mount is a slight concern first because it wouldn't be directing air straight into the GPU, but deflecting it off the PSU housing which interrupts the path of the airflow and creates some crossflow (straight up after deflecting off the PSU housing crossing the flow perpendicular to the angle of the fan) and second because the air pressure created by blowing right into the PSU housing obstruction could make the fan blades drag unevenly through the bottom half of their arc and make excess noise and/or wear down the fan faster.