I'd rather keep the radiator by itself, rather than heat the air going to the (passive) chipset/mosfet sinks. Moving the 5.5 bays would be a lot of work I think. A BIP2 in the bottom and a single 120 exhaust up top would total only 3 120 fans, plus whatever the PSU had. With the PSU completely isolated, a passively cooled Phantom would probably function nicely, even under heavy power draw.
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