Unfortunately that was the ONLY picture I could find of the grid arcade machine, it seems Midway doesn't even support that game anymore, so they took down it's website. On the Quake cabinet, yah that was a keyboard, so the owners of the arcade could modify the game and such.
I'll explain how the grid's control panel is setup, and its pretty much the same as the Quake one, but they use a joystick instead of buttons for movement.
-One 3" trackball to look around, inverting movement feels much more natural on your hand.
- X amount of buttons around the trackball, well it has 1, but you can put as many as you want for things like crouch, jump, +hook, etc. Quake only has 3 extras for Change Weapon, Fire, and Jump.
- 1 analog joystick, you could use just about any analog joystick you find at the store, just make sure it's not made of cheap breakable plastic like my Raider Pro Blue joystick, I almost bent the plastic outta shape during a game of Half Life.
- Optional idea that the Grid has on it, is one of those telephone keypads, they use it for entering passwords and cheats, but you could use it for selecting weapons, etc. I don't know exactly where to find one, but I'm sure you could find it somewhere, maybe even an old payphone *or new one, just don't get caught*
I've been thinkin about this kinda control panel, and I think if I ever make a rotatable control panel, one of them will have to be a FPS panel, because playing FPS with a trackball is just way to fun, I used to play Half Life online with one and a joystick for a while, it was very fun.
-Luke