Step 3: Wire it to Arcade Controls
You can do this even without a mame arcade cabinet, the only piece you actually have to have to make this really easy is a board made by a company called ultimarc, that emulates a keyboard. The board is labeled with each button name, and all you have to do is plug in the wire for each button and you're ready to play. Super super easy.
you can get the I-Pac board from ultimarc from HERE
I have an old version of the board, the new version looks smaller and cleaner. Very worth the money.