The optical and hard disk drives fit into their designated places with ease:

I put a floppy drive and a second HDD on the side ledges:

The ledges on the side panel are universal – you can put a hard disk drive there…

…or a floppy-drive:

So, everyone’s accommodated. After I attached all the power and interface cables, the assembled system looked like that:

On the snapshot of the system made from behind, you can see the ill-fated vertical bar that the graphics card and other expansion cards are fastened to. The connectors of the mainboard press against the I/O shield, an accessory to the mainboard:

The system is complete. Let’s test it!