I took that on board. and came up with this.

Looking good! Just a couple more tips though:
- Instead of using one big speaker, why don't you use two smaller PC speakers? Despite being cheap, they have really good sound quality (just don't spend significantly less than ten to fifteen dollars/ pounds/ Euros) and you'll get stereo sound. Such big speaker is total overkill for a bartop. Also, have you thought about the height of the speaker - remember, you need to put a light source into the marquee box as well. Additionally, I don't know whether it's intended this way (in this case just ignore what I'm about to say, it's your machine so it has to look the way you want it to), but the overhang on your machine looks a tad excessive to me and you could reduce it a lot if you used small speakers. Once again, sorry if this is the way you want it to look, I don't mean to criticise your personal taste, it just looks as if it's that big to accommodate that huge speaker you want to put in it.
- Regarding the control panel: remember that joysticks have mounting plates that you need to fit into the cp box. Your left joystick is so far on teh left that I can imagine that the mounting plate won't fit in.
- Button layout: check out slagcoins website:
http://www.slagcoin.com/joystick/mounting_layering.htmlhe has a ton of great info/ tips on how to design/ build your cp (he talks about joysticks in boxes, but the same principles apply), among them cutout templates for button layouts used in real arcade machines. (The short version: Just do two rows of three buttons with the L and R buttons on the right; you can either put them in straight lines (American layout) or curved (Japanese layout), and although it seems more logical to me to use a curved layout (after all, fingers have different lengths) this is largely a matter of preference, so just draw them on a piece of paper and try it out; you can also take an old show box and install a joystick and buttons in it, this way you can make sure that you know exactly what you want).
A headphone socket is always a good idea, I put one in my bartop as well. Now my wife just complains about my raging at the bullet-hell shooters because I'm terrible at them...