You'll need a kick harness for anything beyond the normal JAMMA button inputs... ie the 4th through 6th button for fighters.
That isn't "all" you need though.. you'll obviously need an MVS motherboard, and a CPS2/3 A/B board combination to play the games.
If you want an all in one machine, you'll probably want a multi-JAMMA board as well so that you can have them all hooked up at once.