I wanted to be able to hold and charge my phone in the middle of the keyboard (blank area).
I had the clamp design ready, from the days I used a touch-based security key, so I added a MagSafe charger on top and here it is.
I'm also attaching the openscad code, it's easy to add other accessories by replacing the magsafe_puck() with something else.
The author marked this model as their own original creation.