I am a happy man. I hooked my CPS3 up to my sitdown cabinet and it actually worked... sort of.
My monitor is still in proper vertical shooter positioning so it was kind of hard to play, and I only have 3 of my buttons hooked up so I had no kicks... but who cares!1 It works.
I also figured I'd post some images of the board and whatnot for the hell of it.
Also, I figure that most have never seen a CPS3 board before, so consider it a history lesson... or something.
This is the board:
