I came across this while searching for Christmas gifts and thought it would be the perfect thing to hack into a neat launch control box. It's got everything you'd need; arming light, key switch, two toggle switches and a big red button with a plastic flip-up cover. It's a bit expensive, I'm sure you could buy the components separately for much less. But it does come in a nice aluminum box. I think it also comes with some sort of sound effects although we kind of supply our own so that's not as useful.
https://www.thinkgeek.com/computing/accessories/9116/zoom/
https://www.thinkgeek.com/computing/accessories/9116/zoom/