Been looking at a lot of control panel threads as I will soon be planning my own. I have a couple of questions, most of these I have asked myself in trying to determine what I want and what I need on my panel. I just acquired a NFL Blitz 99 cabinet and will be using the 4 player control panel, but converting it to a 2 player. I want there to be plenty of room, something that was lacking on my first cabinet.
1. Do you really need the dual trackballs? I orignally thought about this as well, but really only know of one game, Marble Madness, that would use it. They could be used in racing games for steering but I do not think that would be the best option. Also how often, in the grand scheme of things, will you have two player playing Marble Madness.
2. Dual spinners would be used more. All the racing games, Super Sprint, Ivan Stewart Off Road, Danny Sullivan's Indy Heat, Fire Truck, etc. Would allow you to use the spinners for steering and the buttons for gas, brake, etc.
3. I think your Pinball buttons all need to be on the outside of the control panel, perpindicular to the screen. Even if your control panel is wide it will feel more natural there. I would also recommend they be on the same level horizontally and not one on top of the other.
4. If you use U360's you get the advantage of using the maps and would not have to have a dedicated 4-way in the middle. They map for diagonal games and work great with Q*bert and Congo Bongo.
Hope this makes sense.