Sleeving fans, the Cooler Master 120mm are good fans, they move a lot of air and should only be used with a fan controller or there will be too much air noise. They also look nice for this build. The silver wire isn't bad looking, but as I'm sleeving everything white, it has to be changed:
Not sure about the brown plug though
Anyway, for white I usually try to get tight and neatly fitting layer of white tape on first, even my sleeve is pretty tightly weaved.
And it's done, Also changed the plug color to a more white looking one.
Next ! - well luckily this build only got 4 fans as the excitement of sleeving does go away quickly