Why would you choke the intake?
I know Arctic P fans can pull well, but you still need space between fan and mesh, and enough perforation in the mesh for the system to breathe.
The colours work well, though I feel like the front green is a bit much. It needs something to break the solid wall monotony. I believe larger holes would help here.
Maybe it'll be better when the system is finished.
Nope. Too much power for consumer fan controllers. Most of them barely use 2W per fan.
Well, you can get an Arduino and code your own hub, you're already able to control it with a knob, so just automate it with a microcontroller.