Thank you Redstoner and Pifan! Making ball tops was a long but satisfying learning process.
@batman Thanks for saying hi :) I've had difficulty shipping internationally in the past, however last week I learned that padded envelopes under 4lbs are much less expensive to ship. Although assembled frames are out of the question smaller DIY frames could be possible but I haven't tried it yet. Email me cuddleburrito @ gmail and we can play with numbers to see what they would be.
I was thinking about multiplayer, and the easiest would be to connect a second controller to the RPi's USB port. I've got so many questions regarding simultaneous button presses across GPIO and arduino emulated keyboards. I'll report back with my experiments.