Unfortunately, I've kept no photographic documentation on the building steps, because I've built it on the fly using some wood that I already had in the basement. This is the final result. The joystick top is 32.6 by 17 inches, 1.2 inches thick, and almost bulletproof.
The hole in the center, between red buttons, is for the spinner.
Joystick, final version
To get an idea of the joystick size, look at it compared to the huge box of the CoolerMaster Stacker case.
All the components (pushbuttons and joystick) is made by Happ Controls.
Joystick, compared to Stacker
Click on the pictures to zoom.