Just go buy a Silverstone ML05?
SilverStone ML05 INTRODUCTION (silverstonetek.com)
I've got a used one here from my old server, but probably wrong country for you.
but honestly, solid case, cheap, 7ltrs, sfx psu if you want 4 2.5" drives + options for two more so up to 6, or sfx-L and 2 2.5"...