Doc you should post a video the first time you try it weather it works or not. I'd like to see this. Glad your thinking safety first. Hope you don't get hurt man. Wish I smart enough to make cool stuff.
defiantly post videos and pictures i think this is really cool thing that you are doing and I'm interested on how its gonna be done
The being able to switch between one draw cycle and more I think will be key. Seems like you have thought about anything. Good luck and remember eye protection.
Wouldn't want to see someone who derailed the cable or accidently dry-fired a bow with the capabality of shooting 600 fps! That'd be bad.
Good luck with it mate, Keep safe and chuck up heaps of vids n pics as you go along would love to see the progress your making. Good luck, Matt