Here's my attempt at cable management:
Rather than procrastinating till I get to do the window and the blowhole and till I sleeve all the cables (which might take another couple of years at the current course and speed) I decided to put everything together ... For now I stayed away from irreversible mods, so I just did a number of small things:
* removed the buzzer glued to the bottom of the case (mobo has one anyway)
* routed mobo aux power cable behind mobo
* routed front (exhaust) and rear (intake) fan power behind the mobo
* routed CPU fan power behind the mobo (the thinner sleeved cable in the "back of mobo tray" picture) -- it's connected to 12V, since Noctua fan is inaudible even at full speed
* installed C-02B CD/DVD bezel
* replaced stock grille on the intake (rear) fan with a fine-mesh removable/washable one (I think it restricts ariflow a bit more, but I'll take that over insane amounts of dust in the case)
* removed internal grille on the intake (rear) fan
* stuffed 5 HDDs into the case and tried not to create a cable mess
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