My left side has a magstik plus, and three push buttons (plays all of my verticle games, although it's not authentic to play asteroids w/ a joystick...i don't mind it)...my right side has a track ball, and two buttons to play all the trackball games I have (I might install a spinner on that side too).
my long, horizontal side has a 2 player "street fighter" setup.
the "coin buttons" (I won't have room for a coin box) will be beneath the horizontal control panel, on the actual body of the cab, and i'll have P1 and P2 start buttons on the "face" or front panel of each of the control panels...