The private/instrument syllabus was a trainwreck. You should know that. It just doesn't work out that well. It skips the entire principle of building blocks. I hated it. With a passion.
The commercial is great. Although, looking back, I don't think that most of us instructors really understood the 135 thing at all. At least not the peripheral stuff you have to do. How could we? None of the original guys who taught it had worked anywhere but MTSU. Since I do 135 charter now, I know I'd really be able to show a student what that demands.
I will tell you this, partial panel in a G1000 is a joke. Unless the system has a catastrophic failure, there is hardly any difference in the way you fly. Might not be able to use the autopilot, but that's no loss if you have the handflying skills. If it does have a catastrophic failure (like loss of both screens) you can only hope to find VMC and stay there anyhow.