Two month later update!
I finally finished drilling, bondoing, and sanding the thing down. I decided to throw in 6 buttons for each. Probably a bad idea but whatever. It's mostly going to be played by small children, or me alone, so I'm not too concerned with being cramped. Probably didn't need to drill a seventh hole for a start button either, but I really want a damn start button. I started by poxy'ing metal plates to the back so I could clean the whole thing up with bondo and get it nice and flat. The bondo all came out great at first. BUUUUUUUUUT as soon as I started drilling the button holes half the time the plates would break off mid drill from the back and crack my bondo or jag up the metal. So there was a lot of redo.
It may have been the epoxy I used (Loctite Metal/Concrete Medium Grey Epoxy) but it drove me crazy. The drill would warm the metal, the metal would warm the epoxy, and then I would throw a fit. This happened probably four or five times, but I'm stubborn and didn't want to start over anywhere. I feel the panel looks a little sloppy because of this but I believe I left myself a little wiggle room so that I can force the buttons into a straighter position than what the holes show themselves.
Also! I found a place nearby that will powder coat the thing, with a nice protective clear coating that just looks top notch. The guy told me that it will cost just between $20-35. I'm pretty excited for this, but now I have to figure out a color. Right now I've pretty much decided on Happ Purple buttons, black bat joys, and I'm playing with the idea of the Cool Blue T-Molding from GGG. I need something that will compliment the blue and purple, but I'm not so good at visualizing how they will look together. GGG doesn't seem to offer a purple t-molding that would match the buttons, and I don't really like how expensive the t-molding is elsewhere.
Also, I gutted out the cabinet itself. Took out the coin door and the monitor, not sure what to do with them yet. The power supply, marquee lighting, and the JAMMA board look to be the only thing usuable anymore. I got all the vinyl and adhesive residue off the front, and eventually I'm going to sand the whole thing down and fill in all the holes.
Here's a picture of a couple D-Frame PC cases these guys did that really sealed the deal for me.
And then a picture of my suedo-finished CP.