1. Cutting it isn't fully necessary, but can be done by making the before mentioned plate. It will not work without this plate, I have tried.
Just a mock up I ran with for a while, I am going to run it full time once I get around to doing the mounts and side covers.
2. Do some research on RFID
or Remote Start/Ignition
3. Guts and a prayer no thief is going to toggle the starter switch.