I'm not sure if it totally applies in your situation, but I'm gonna chime in. My cab has the original arcade power switch mounted in the routed hole on top of it, and it's a SPDT (I think that's the designation) which is the same style switch as my PC power supply (AT-style), so I just extended the lines from the power supply up to that switch, and voila! realistic arcade powerup! Then I'm using 12vdc from the power supply to run a pair of PS cooling fans that I "borrowed" from other PSs, mounted on the back panel at the bottom, blowing inward, to displace the hot air with cool from near the floor.
On top of this, the AT-style power supply has a 110vac output (for booting up your monitor when you turn on your puter... you know what I'm talking about)... well, I bought a florescent fixture from Home Depot that is switch controlled (not momentary button), and hacked a cable to that AC output, so whenever I flip the switch, my fans, internal lights, coin lights, marquee, and all turn on at once. It's pretty nifty.
Enough jibber jabber... I hope this helps a little... if you have questions, write me or post here