There is two different left frames, one with all of the autopilot buttons you are looking for and one without. You can build it so that the fet screen does or does not have the buttons. Not all aircraft have all of the buttons on both screens in the g1000 set up. I will be building mine with all buttons on buth sides. But the autopilot buttons are definitely already in this g1000.
Autopilot functionality is built into the G1000 so it already has an autopilot.