btw, buy a cheap piece of press board (whatevers cheapest... I got some crap for 5 bucks for a 4x8 sheet) and try a few different possiblities. Don't finish it until after you like it. I've redone my 2player SF control panel maybe 4 times now (6 buttons, 7 buttons, curved buttons, ect) and still considering doing it again (I want the 7thg button on the bottom left instead bottom right).
So cut a few boards in the right side... and make sure its comfortable to play next to someone.