Hmm, weird, in the video with the cable management hack:
He's actually using the ML240 AIO which according to specs on Coolermaster website has a pump with a height of 57.8mm which shouldn't fit in the 4 slot GPU mode he's using according to ssupd specs (supposedly max 53mm). This makes me think that Kraken that have 55mm high pump might actually fit, I think there is a difference in a way they measure this.
EDIT:
He confirmed that the pump touches the mesh panel but doesn't interfere with closing it securely. Wonder if the extra 2-3mm from a shorter Kraken would allow for the glass panel to close.