I am looking to build a quick case for my Sieg KX3, not only to keep the coolant from splashing everywhere, but to try to limit the noise as much as possible as I am using it in an Apartment (20th floor)

I noticed the KX3 has 2 fan coming out of the electronics box and 1 fan coming out of the spindle box. Should I add a vent/fan at the back of my box I am trying to make?

Is there any quick suggestions for making the enclosure as sound proof as possible? I was thinking gluing foam to the outer side of aluminum (should I do inner side as well?)

Here is the case I quickly drew up.