Join my club! (See the feedback req on cocktail plans for my thread)

I've laid this out in CAD (Intellicad, it's free and uses autocad files) for my cabinet, same CP idea as you but with a trackball as well.
You can get stick and button dimensions from your supplier, in my case
www.ultimarc.com, or try
http://www.happcontrols.com if you're using their gear. I have 38mm from button centre to centre, which leaves 2mm between the button trim rings. ~83mm between stick centre and button centre.
Everyone else seems to use visio and there's templates around, but if you have CAD I can send you my files.
As far as the layout before cut goes, a 100% printout stuck onto the panel would help you out, failing that you'll have to get down and dirty with a ruler and marker.