At this point, I really think the best option is going with a top-intake and back exhaust setup. So one big 140 as intake, with a fan duct to the CPU cooler, then exhaust at the back with the Arctic S8038 (for now).
As I'm conducting my CPU fan tests, the next step after the Silver Soul 110 is going to be the Silver Soul 135, so maybe I'm going to replace the Arctic 80 mm with the 92 mm fan of the Silver Soul 110 and add another fan duct. Which entirely depends on the SS135 performance.
As there are going to be TWO intake fans, the VRM + rest of the board should be cooled sufficiently, too.
For the GPU I'm going to add longer intake fan ducts, and see whether or not additional bottom fans make any difference.
Exhaust should be to the sides, and as there is also a short pass-through exhaust, similar to the Founders Edition, this one is going to be ducted to the side as well.
Edit: Just realized the PSU exhausts to the top, so we can only go with one 140 as intake. But at its back there is still enough space for at least two 60 mm fans, and as I already got the NF-A6x15, those should do for now. Might even be enough space for a 92 mm slim, too 
cu, w0lf.
