Ryu1
always loved your work man...
and speaking of slide outs...

Why must it be an either / or....
slide out or clamshell?

why not something like that one...god what was it now? a moto or samsung .. I think?
it was a BT keyboard with its own battery...
and it "snapped in place" on the device (landscape mode of course) and so showed the keyboard below the landscape mode.
And when not in use it could be snapped into place and doubled as a screen-covering shell to protect it...with the keyboard facing the screen ...and the back of the keyboard casing taking the scuffs and scrapes and dings instead of the screen.

Genius idea...
Only problem with it was in the weight.
It weighed enough coupled with the weight of the phone... to feel heavy after a while...
That was the only design flaw IMO.
Better designed to relieve some of that weight...
the concept is an option instead of either / or ...

update:
It was a samsung s4 keyboard case
Backlit, wifi, bt, and the phone could be flipped over so the screen was facing inward ...to protect the screen...
a good case and keyboard idea in one...
a universal "fit" model would have been better ...if it was possible...
But designing such would mean one would have to pick a max size phone as a model and make lesser sizes fit inside said maximum sizing.







the weight of the phone if I remember ...was heavier...
It's design issue was balancing that weight out ...
pretty cheap too....well....cheaper I am sure than the TOHKBDXYZ ...
https://www.ebay.ca/itm/Backlight-Wi...9L4s:rk:1:pf:0