Ok, so I figured out how to open the damn thing. There are another 14 screws underneath the board, 6 visible, 7 hidden beneath the rubber pads
and 1 under the sticker in the middle of the keyboard. Here's a picture, the hidden screws are circled in blue:
For those who would try to open their Roccat Ryos, do not peel the whole sticker off, the glue is nearly impossible to clean.
Just find the hole where the screw is located and pierce the sticker with your screwdriwer.
As for what's beneath it, there are another six screws holding the keyboard in place under the lid:
Now my question is, how do I get rid of the blue plate above the PCB ? Looks like it's soldered on different places.