After a long while (my 3D printer waited on parts), resumed the project.
The assembled PCB is out of the storage box:
Note 6 optical buttons in the middle:
The buttons have inverted force profile: the initial force is 35 gram, then decreases down to 11 gf hold force. The full key travel is 2.2 mm, and the button press is registered at 1.2-1.3 mm. Buttons work with a pleasant metal click; at this point no intention to make it quiet (let people admire a mechanical keyboard on the smartphone!)
The keyboard top now looks like this:
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