Case Design for Liquid Cooling

[Mick64]

In my humble opinion, there should not be dedicated 3.5" HDD rack in the central part of the case. Instead, it is better to have additional 5.25" bays, where 3.5" drives can be mounted in removable cage (like Coolermaster did in their original Stacker design). This approach has the following advantages:
1) It is more flexible - you can use available space for whatever you need - 5.25", 3.5", 2.5" devices, reservoirs, or even install additional radiator in front of the case;
2) Front intake fan will work more effectively without having to blow through drive cage walls spanning across the case right before it (instead, we get some sort of the duct formed by 5.25 bay walls); Having a lot of spare 5.25 bays allows to install not 1, but 2 intake fans, which will more than compensate decrease of fan size;
3) It is more future proof - we are going to use 2.5" SSDs soon , which are silent and cold, so they can be stuck just to any side of the case and dedicated 3.5 bays will be totally wasted;
4) Integral side walls of 5.25 bay area will make entire case more rigid;

IMO, 3x 5.25" drive bays would be enough, but I have provided the option of another two at the expense of reducing the 120.4 to a 120.3. The HDD drive rack would be removable anyway, so that you can have the drives in any orientation. I may even provide an optional alternative rack designed to hold SSD's, I'm just not quite sure of the dimensions at the moment. I'm pretty sure air flow would be more than adequate and you could always fit a 160.1 rad in front of that 200mm fan if you really wanted to???