This is the airflow scheme I came up with (I got lazy and used models from GrabCAD).
Four identical case fans to ensure PWM splitter functionality.
Two 120mm on top as (mostly) dedicated GPU intake
One 120mm on right side case panel, dedicated CPU/mobo intake
One 120mm as case outtake, mounted outside to reduce air pockets, stamped fan grille removed for noise reduction.
PSU 120mm as additional outtake
Assuming the PWM splitter has all four case fans working at approx same RPM and PSU is outputting a little bit at all times, I'm having a strong positive pressure, but thanks to the top-down CPU cooler and most likely a GPU cooler that mixes the air up in the case a lot, I should not end up with too much problems because of positive pressure. I'm also liking the fact I have dedicated intake for both high-power parts. I don't think it's gonna get much better than this, in a case this size/form.Edited by chir - 3/2/16 at 12:41pm