Well my whole "wooo lets remove the drive cage and stack drives on top each other like they're pancakes" idea went out the window as soon as I got my 3rd drive -_-
While separating the drives with bits of sponge worked out wonderfully because my HDD became almost completely silent, the whole stack toppled into my 120mm bottom intake when I wasn't around. FFFFFFFFFFUCK. Luckily the fan seems to be alright.
So the cage went back in...
...and strangely enough, the issues I was having with the side-panels not fixing on properly also went away. Apparently the drive cage is helping to support the case structure, keeping it 100% straight. Who knew?