@victimrlsh I know it's meant to have a rotary with push-down for fire, with a separate single "grenade/enter tank" button in the middle of the panel.... so I did the best I could with my panel and it works fairly well.
I have a split two-player joystick setup... left joystick is set to be the player control, right joystick is the gun/turret position control. Directly below and next to the right joystick, I have two buttons for the old school "two-player" games. The button closest to the joystick I can hit with the base of my hand, or just point the joystick and drop down to fire continuously. So that became the "fire" button. The adjacent button is the "grenade/enter tank" button, which I can slap or hit quick with my other finger, then jump back on the joystick.. etc.
Also.... my Joysticks on this particular cabinet are original Wico leaf-button sticks. I tried using the newer cherry switch style buttons that I have on another cabinet.. but the feel is not the same.
If you need a pic, let me know.