Want to be really ambitious? then have a go at designing it for yourself

, looking at it, it's just a big box, so won't be too hard, just get a big bit of paper(or tape some smaller bits together) and start sketching it out life size. You start at say 800-900 mm long, say 400-500 deep, and it won't be far off. Might want to consider the size, though, do you really need a 4player panel? really? as for button, joystick placements, again just draw some 30mm circles, and move them around until it feels comfortable.
i'm almost finished my first cab (cocktail) and i just followed the 'keep it simple' rule, at least to start with....
hope this helps, cause really it's not that hard to design this. Construction may be your concern, but take a look at the construction sections of the hundreds of examples available on this site - a little research goes a long way!
