The case I had back then (EVGA Hadron Air) annoyed me with the psu noise, size and somehow I found just buying components not satisfying. I had seen a few ammo can speakers on Instructable and noticed that the boxes were quite similar in size compared to the smallest dimensions I could achieve by cramping the components together. After further googling I noticed that I was sadly not the first one to come up with that idea but the first one to provide sufficient and economic cooling for higher end components, so I just gave it a shot.