I wondered about that also. I was a little surprised to see that he didn't (appear to) put in any sort of shock mounts or buffers between the side plates and t

I wondered about that also. I was a little surprised to see that he didn't (appear to) put in any sort of shock mounts or buffers between the side plates and the drives themselves. He seems to know what he's doing, though, so perhaps it was a purposeful tradeoff in order to use the sides as heat sinks? By mounting the drives without shockmounts, you can transfer heat directly from the drives to the enclosure chassis. In terms of preventing drive failure that might be more important than vibration reduction.