To answer SirPoonga's question:
The half circle in the middle of my control panel serves a few purposes.
I wanted to be able to have multiple types of controls. Normally people have multiple control panels or try to fit whatever they want onto 1 panel.
Since my panel is made out of fiberglass, it would be a lot of work to make multiple panels. ( would have to almost make complete panels) Also I didn't want my CP to be cluttered.
So I made CP inserts. This way, I wouldn't waste money on identical parts (1,2 player start; 3rd and 4th player buttons and controls) but leave me the options of having any kind of control configuration.
Also with the half circle configuration, they can move to any side and still fit with the proper angles. I prefer to have the joystick on the left of the buttons but I have a few friends that like to have them on the right. I can build one insert this way and then they could use it on either player 1 or 2. Also when there are 4 players, the inserts will be closer together but when there is only two (which will be most of the time) they can slide further apart to allow more elbow room.
Below is a pic of how the CP inserts look. I have them made but do not actually have pics of them yet.