Here, let me save you some trouble. The panel is big enough, my best friend has one of those Robocop cabinets at home, and the panel is plenty large enough for a 2x7 layout. It is a pretty standard sized panel, seen plenty of them converted into the Streetfighter series, which is the 2x6 layout, and the 2x7 layout doesn't take up any more space.
You would also have a heck of a time extending it without making it look terrible. It is a curved metal panel, and it follows the lines of the cabinet.
Also, if you aren't keeping with the Robocop theme, then would you be willing to let my buddy have your Robocop bezel? His machine doesn't have the graphical bezel like yours does.
Also, to do this cleanly you will likely need to locate a Bad Dudes control panel (or other dual joy panel that fits that cabinet). That sholdn't be too hard to find though.