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i have a 280mm aio in the fron already. the kraken x60 its 312.5mm and is extremey snug fitting the ex280 is 320mm. so ive to only find 7.5mm room.
Will probably take a dremel to the bottom of the case were the HDD bays used to be as its slightly raised.
I'm sure I've seen a build log on OCN where the guy (or girl) used a 280mm in the front. I'll try to find the build log for you.
(I've sent you an email by the way)