The fans purchased are linked in the mod. I removed the 3 other fans in the control panel. I wired 1 blowing in to the 12v out that the other 2 case fans were wired to. I removed the top of the Power supply (and left it off), and wired a fan blowing out to the pins the PSU fan was running. Between this upgrade, installing a Noctua fan to the heat break for the hot end, and a blower (+Fang) for part cooling, the loudest thing on this printer are the X & Y stepper motors, which are quite silent.
With the amount of supports needed for these to print, I printing on a single layer 80% raft, so that the rafts had something solid to adhere to. Totally up to you, though.