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So again, the top right location is where the PSU will be positioned, any ATX type will do fine as there is plenty of space for it.

Heck, up-to roughly 20 cm even isn't an issue, then add to that some cables which you can tuck away in the rear. There is plenty of space for even the longest PSUs. The lower drive cage can hold an SSD at the bottom, but it can also store three 3.5" HDDs.
 

Basically you mount four rubberized screws (prevents resonating) and mount the HDD in the cage. BTW before you say "HUH, is that IDE?" Correct, this is just a mock-up unit.  Now this would not look rather cool with that big glass windows right ?
 

So Lian-Li simply included a cover which you can place to the font of the drive-bay, and boom sweet aesthetic darkness again. Simple, effect and that looks great. At the backside of the chassis you can mount more HDD/SSDs, 3.5" x1 + 2.5" x2 or 3.5" x2 or 2.5" x3.