When SSF cases are designed, preservation of space is needed.
What I have never understood. Why is the PSU always placed right under the top RAD? In my mind, if I am really doing some serious work, my PSU is working away. The fresh air pulled in - cool. But the air is hot when that fresh air goes across the PSU and comes out the top. Why is the hot air always dumped right into the top radiator??? Now the top radiator works almost twice as hard as needed to keep the components cool.
Why not take that PSU and flush mount in line with the top fans? So when the heat comes out, it goes right out of the case. Why not make the case just long enough to pass by the top radiator and still accept a 360 radiator? It is always puzzling when I see this.