you don't HAVE to use an emulator for the controls, you can hack a keyboard, lots of folks have done it. I use the Jpac or Minipac, for me it's easier, just plug and play, USB, marked for the wires, but there are cheaper ways. HAPP controls are OEM for a lot of games, but you can certainly use used buttons. the microswitches are pretty much universal, HAPP sells them but so do most online electronics distributors. I have already had to replace some of my new buttons switches just from wearing out...
Options for tracballs exist, I bought my last one, but have seen people make them from mouse, there are templates you download for the encoder wheel to print out. or you can find steering wheels and other Nintendo/game system controls that can be hacked.
tons of good info over on BYOAC site Build Your Own Arcade Controls Forum - Index
if I build another cabinet, it will be dedicated to driving games, got the wheel already but no space til the kid moves out!
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