It may be easier to address the source of the sound. Try these...
Extend overflow pipe below the surface of the water. This made a big difference for me.
Buy pads for you pumps so that they are not vibrating against the sump.
Depending on how your baffles are setup, stuff filter floss between them.this also helps with micro bubbles.
I imagine that insulating the stand will increase the internal temp. Not sure that it,ll make a significant difference, but I would keep an eye on the temp effects.