Answer:

With some “poetic license” … A wind/watermill converts hard-to-use energy (e.g. wheat kernels/flow of water) to easy-to-use energy (flour/electricity), and a slaughterhouse makes ready-to-use proteins (meat packaged for sale, according to merchant specs (genes)).

Cytoskeleton — City streets

Lysosome — Waste disposal

Mitochondrion — Windmill

Nucleus — City hall, archives

Ribosome — Slaughterhouse (transforming livestock to useful proteins)

Other “cell city” features:

Vacuoles — Waste recycling and water storage

Peroxisome — Detox clinic

Centrosome — Road/street maintenance

Golgi apparatus — Post office

Transport proteins — City wall gates

Extracellular matrix — Moat