I always was under the impression pushing air across the cooler was better than trying to pull it through. The cooler itself would restrict the airflow a bit with the fan pulling it and having that exhaust fan where it is would help pull the hot air coming off the cooler that's being pushed through if you put the fan on the other side. Probably makes a minimal difference, but I'd do it differently.
If you mounted the hard drives the other way around you could probably have the data and power cables for the HDD's a bit better hidden.
Not trying to nitpick, just a couple things I noticed. Overall looks very clean. I like the dark aesthetic with flecks of red in places. :good: