Thank you for the great information guys! I'm going to go ahead and mine away because I don't think I'll be able to buy any more miners at that kind of price.
Here is a link to pictures of my quiet box build. It keeps my L3 at about 38 decibels

I haven't had time to build one for my D3 - I'm using blyssz firmware and running it at the lowest speed possible.
https://sites.google.com/view/rebel-mine-co/home