The hot swap bay is a complete waste of time. Get rid of the PCB and just hook up your drives straight to a SATA lead and power. why anyone would want to hook up their drives to something with known issues is beyond me. The case itself is a great design, easily beating Corsair's 540. To make more room in the basement get rid of the SSD bay as well. There is no point in it. An SSD can be put anywhere. IT has no moving parts. So doesn't need screwing down into a metal cage. with it removed you can fit a 160mm rad and fans to the rear basement exhaust.
Ssd cage? There are 2.5 inch mechanical drives which do wonderfully when mounted in that cage and air is blowing by it.
I didnt even know 160mm rads are available? That sounds like a great idea for when I acquire a gpu that deserves to be water cooled