I live in a suburb of New Orleans, LA (the Mississippi River seperates me from the city), and for the CPS2 just make an offer ill accept anything that is reasonable .
For P3 & P4 the buttons/joystick are mounted at an angle - up on the joystick isn't straight up to ward the monitor but a diagonal so that it works corrected based in the users perspective etc and the buttons are setup in a diamond layout.
I chose a 4 8 8 4 layout because I wanted 8 available for P1&2 for psx,ps2, wii, and others that may need it, but knowing the majority of games supporting more than 2 players use 4 buttons or less I figured 8 at those spots would be a waste.
The cp does stick out right now, but once I get the tmolding on, and get the laminate/paint matching the rest it will look great, and as a final step it will get a nice custom overlay and a sheet of lexan.
Everyone who mentioned the lighting and graphic potential I'd love to here your ideas! I'm unfortunately getting divorced in march and about the only good part of it is that the cab can go in a corner of my living room so that my kids and/or I can play without being seperated from everyone who isn't playing, but Because it'll be in the front room I want it to look as awesome as I can get it.
Also coming, airsoft ak47 lightgun conversions with recoil and mounts on sides of cab!
Edit: I am also considering a push/pull spinner above the trackball and twin replica tron sticks with dual thumb buttons from groovy gamer on both sides of it but Im not sure if ill use them enough (I'm 26 and was raised on NES so I missed a lot of those type games).
I got that trackball (happ 3") for $15 shipped on eBay it works but the y-axis isn't perfect so ill eventually being replacing the rollers when I get a translucent blue, smoke, or clear ball and mount some LEDs.
Finally it looks like these zippy sticks from twisted quarter should work with the shaft/balls from paradise arcade so ill eventually have lights there as well.