Looking at your build pictures it "looks" like 15-20mm more space in there (.5-.75inch) maybe. That cooler is 37mm high at 50-60mm sounds like the maximum but at sixty Id cut some holes in the roofI have an NH-L9i in mine and from a glance, sure doesn't seem like there is that much additional space, but I am not in a place to tear it down and measure it at the moment.
That being said, you can see in the post about my build, how tight it appears to be. Maybe I am under estimating the amount of available space.
U-NAS 810a - Xeon e-2100 - Build Thread
https://forums.servethehome.com/index.php?threads/u-nas-810a-build-xeon-e-pics.23187/
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