The above does work, as I just reinstalled Pinbox last night, however, this line has an extra space after "pinbox.desktop / etc/xdg/autostart". Also "dekstop", should be "desktop", haha.
This:
cp /root/pinbox/scripts/pinbox.dekstop / etc/xdg/autostart
Should be this:
cp /root/pinbox/scripts/pinbox.desktop /etc/xdg/autostart
Also, you may have an issue where the screensaver kicks in. After the game boots, plug in a keyboard, and hit "F1" to exit out of the emulator, and then go into the terminal. This will remove the screensaver:
Screensaver deinstall:
sudo apt-get remove xscreensaver