Shifter, but you can also get that from DF. Cruise control and automatic headlights come from the stock Cobalt computers. Turn signal switch also has the light controls. You mentioned steering, but that includes both the rack and tie rod ends, the steering shaft, and electric power steering if you choose to run it. Pedal boxes also includes the Cobalt brake booster, again, if you choose to run it. Fuel hat and pump assembly, a few of the parking brake components (handle and guide tubes). Axles and wheel bearings, not sure if the DF subframe and suspension kit will include knuckles (I think so). Coolant reservoir, and radiator hoses, off the top of my head.
The other thing you'll run into is that a lot of the hardware used for construction comes from the donor. You'll get nickel'd and dime'd buying Grade 8 and Grade 10.9 hardware where it's needed (although probably not more than the cost of a donor).