Areas in Wizard of Oz, science project?

i have a bio project thats called cell city, & i have to make a cell into a city. i've decided to use the Wizard of Oz and make the land of Oz as my city. I need areas in Oz to use as areas in my city. IE, Emerald City is centered in Oz, & im gonna use it to represent the nucleus of my cell. The red and yellow brick roads are gonna go around the city, & im gonna put the woods, the witches castle, the corn field, & munchkin land in there, but im not sure what to use them as & i need more areas of Oz to make into parts of my cell city. I need a nucleus, a nuclei, DNA, mitochondria, smooth and rough endoplasmic reticulum, cytoplasm, vacuole, Plasma membrane, Ribosomes, Cell wall, Chloroplasts, Chromoplasts, Cytoskeleton, Golgi apparatus, Leucoplasts, Mitochondria=requirements. it has to make sense, IE, the Mitochondria is known as the powerhouse of the cell, it stores the NRG so maybe when dorothy is in em city & they go to the Wash & Brush up co & get renergized and clean thats the mitoc