Looks about right; there's a few things I would change.
Mainly if you're gonna put a main kill switch, I'd put it on the power line from the battery, so that if it's off the computer won't turn on; it'd be like a valet switch. Having it on the IGN doesn't seem like it'd work properly in my mind. It would technically work, but just seems wrong for some reason.
The ACPI wires (green/black) will need to connect to your power switch of the laptop, and having that monetary switch placed in the dash(or somewhere you can access) would be a good idea. Though the ACPI has it's own black wire, so don't tap that into the main ground.