I finished this today for as a suprise for a friend. Actually, he was sort of the boss at my job during my most intense BYOAC days. He'd happily tell me tales of the good ol' Defender/Discs of Tron days (before my time) when I was too sleepy to do any actual work 'cause I was up too late working on some arcade related nonsense. I was a lot more careful in making this pretty then I have been on any of my own projects.
Features:
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Happs buttons
Ebay'd 2way Microswitch joystick (from Joust, I think)
T-Molding
Lexan
CP overlay, printed on paper
USB Keyboard interface from Hot Wheels USB keyboard ($1.99)
You can get the keyboard matrix & my CP overlay on the web page.
http://jstookey.com/arcade/defendercp/defendercp.html