So, i went to my storage today to grab an old rc car I had in there to steal it's servo for the servo, and found a decent base for something beyond just a water pistol, a fully automatic, motor/gear driven airsoft gun, and low and behold, the trigger was nothing more than a spdt switch, soldered a few wires to the seitch, put it all back together, and a few hours later this is what i ended up with the turret in this video

That looks pretty cool. I like the addition of the webcam... One other thing you might think about... other than the Y axis you mentioned, would be the addition of a laser pointer for targeting controlled by the kit. Great job on the project.

Rick