I have a question for all of you:
Why do so many MAME cab builders choose to make the main control panel SO HUGE? Is it so each player has room for an ashtray and pitcher of beer? 
I just find that the bigger that part of the cab, the uglier these cabs tend to look. (No offence!
)
~Ray B.
None taken (then again, I have nothing yet to be offended).
When I first posted I wanted a control panel with four-players, two trackballs (just need that Marble Madness), spinners, analog joystick, yada yada yada. Then it was rotating panels, then a modular section and so forth. As you can imagine that thing would be hanging so far off the side I could have used it for a coffee table.
I started building then had to stop the project for a year because of various reasons (car problems, move, yada yada, etc.).
Then when I came back to this I had that urge for a cab that actually looks like it'll fit in a real arcade. Not that real four player cabs are out of place in the real world, but I was going for the classic look. So I ditched plans for the 4-player panel (when will I ever be entertaining that many people on one cab at the same time anyhow?).
So anyway I share your sentiment now about simpler panels (a complete 180), though I don't think what some people have done with the larger control panels are ugly at all. Actually some of them are rather stylish. I'm not really partial to large panels that house nothing but 2 8-ways and SF buttons but some people are for whatever reason.
You know, to each his own. All that's important is that your creation is appealing to you.
Welcome to the boards.
edit: 'car' problems not 'can' problems