I’ve done the measures on mine and I’m confident that I have the space needed.

For the vents I’ve actually switched to 45° baffet vents instead of holes, they’ll be more on theme for the build and allow a lot more air with less cutting.

Vibration is a great point that I didn’t consider, I have some cork sheets that I can cut to match the fan frame and that should do wonders. I may even add some acoustic foam to the other side just to quite down the metals.