Truck looks great and you are so close. You have tires on it, run with it. Driveshaft might be tricky, maybe the local guys can help you out? You've given alot back to the community, someone must be able to help out. Rear bumper, well who really NEEDS a rear bumper?
Kidding. Forgo the morning coffee for a week and hit your local wrecking yard? Or even Craigs? I know you're a resourceful guy and can get it done!