I know it' been awhile, but I've finished my Mario cabinet and will be back soon with some pictures of the finished product. Meanwhile, my brother's DK3 cabinet is wrapping up nicely. This weekend he finished the control panel, applying the CPO, adding buttons, and attaching the hinged CP to the cabinet. Take a look!
Here's the top-down view with the competition-style buttons. The color scheme he chose works well I think.
Here's an angled view showing the speaker grill panel. Both pieces are hinged for access underneath.
Here's what's under the hood. The next step will be wiring the buttons.