The factory and the cell both need energy to work. In the factory this energy comes from the Power Plant, and in the cell it comes from the Mitochondria.
They also need management, a place where the orders comes from. The Managers office of a cell is the Nucleus, because inside it we can find the DNA with all of the information the cell needs to function.
The Custodial staff, necessary to keep a factory clean, can be related to the Lysosomes, are they are responsible for destroy invading pathogens with its digestive enzymes.
The Endoplasmic Reticulum is responsible for moving material around the cell, just like the Conveyor belts.
The Shipping room can be related to the Golgi apparatus, as it is responsible for protein transportation and export.
The Storage room is easily related to the Vacuole, as Vacuoles are responsible for storage (as well as water regulation).
The Ribosomes are responsible for protein synthesis, which means protein production. Therefore, it is related to the Mixing and Baking.
The Factory gate and doors are related to the Cell membrane, as both are responsible for defining what comes in and out of the cell/factory.
The Walls and studs are related to the Cell wall, as both are responsible for structural support and protection of the cell/building.