That's actually a good idea! A bit voluminous, but a good idea nonetheless!
The only disadvantage is that if you want to solidly attach the heatsinks (aka copper plate) to the sides of the HDD, where it would be most effective, you'd have to design the box-slot with very tight tolerances, and you won't have much clamping force on it, if any.
Another disadvantage is that if you wanted to cool some of the hot components on the PCB of these HDDs, and they happen to be recessed under the top, you'd have to shim them up.
Check out the HDD block thread in my sig.
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