Alright i have black ops 2 and i have been waiting for this question, so anyway:
1. The turbine in the bus depot when you first start off. You will need the fan, the manacin ( probably didnt spell that right) and the little piece of whatever under the phones.
2.the zombie shield in the gas station. you will need the car door and the little cart thing
3. the little sentry gun thing you will need a gun, which is usually on the balcony of the house, thelittle pack of ammo, and the lawnmower but you should know that it will not work without the turbine
4. the parts for the bus. usually they will be in any room that says it requires power to open. there are three parts: the ladder, the porthole and the ramming thing that goes on the front
5. the power im sure you kind figure that out
6. my favorite, but the hardest to make, the new wuonder weapon it has four parts, the jet engine which is found in the tunnel, the gauge wich is found in a cabin in the woods you can look up how to get there, and