We converted a lever action floor corker to a pneumatic one about a year ago. We attached a linear actuater to the lever. We had a single air switch that launched the actuator lever when pressed, and returned the actuater when released. (I'll have to get you guys a picture).
so, here are my thoughts on the subject, having already made one.
1) I can NOT stress just how dangerous this machine can be. I first used mine while hosting a bottling party. I was easily distracted. The corker was connected to 90 psi and ended comming down on my hand. Luckily it only took out a bit of the webbing between my two middle fingers. It could have done MAJOR dammage to my hand.
2) I STRONGLY recomend that you do NOT use a foot switch! If you happen to kick that switch by mistake, you WILL end up in the hospital. I ended up putting TWO hand switches on mine. This way BOTH hands are needed to activate the corker.