To install your HDDs, you will need four such screws (included with the system case):

You should screw them into the drive’s case…

…and then insert the drive into the bay:

The drive is fixed with two locks on the sides of the bay:

The engineers didn’t use the screw-based fastening mechanism as with the optical drives. Quick access to the hard drive may be important, especially for this system case which is likely to be used as a demo platform. And even if the owner is a private individual, he is likely to be an enthusiast who doesn’t use hardware components for any long time.

The assembled system looks like this:

You can see the components inside even if you close the panel:

There is quite a lot of free room in there. People who are frequently changing their PC components are going to appreciate this. It is easy to do any installation/removal works inside this system case.

So, the computer is assembled. And although I have no doubt about excellent results, I will now test it nevertheless.