The first to show you is the mechanical realization of the demo board!
I took photos while unassembling the board. The main technology is placed in the foot of the board.

top view
The board and racks – top view
And up side down
Bottom cover unscrewed
The connection between controller PCB in the foot, and the rotating board PCB. A notch avoids 360 deg rotation to protect the wires.
The foot disconnected. You see the ball bearing between foot and rotating top part
The controller PCB in the foot of the board. On the right side the USB cable and cables to the racks.
And this is the round rotating Scrabble board bottom side. Notice that the cabling is messy, due to connector adaptations.
And this is a tile: The backside opening is filled with a ICode tag and covered with a sticker