Just make your chicken housing in one end of structure and leave the rest open for chickens to run around in if they so desire. By making your roosts , and feed area at that end, your chickens will naturally hang around there. If you need to go away and not able to let your chickens out for a few days, they have enough room to cruise around in. Tight quarters, overcrowding for the amount of given room, are things to avoid. You would naturally have all these issues solved by default.
Now comes the question,,,,,,,, do you need the rest of that space for other uses??? If so, then just divide the shed into your desired size for the amount of chickens you want to keep. The rule of thump, on space is 4 square feet per chicken in coop. The run is 10 square feet per chicken. Nothing is written in STONE , but these are good guidelines.
Here is a link to a thread with numerous pix of coops and related items. Scan thru it and get IDEAS as to what would possibly work for you. Hard for me to make suggestions to you without knowing just exactly what your needs/desires are for your coop housing. The number of chickens kept also a big factor.
Your location (general, not specific. is good to see in your profile) It allows peeps to make better suggestions based on weather, as well as predator activity.
https://www.backyardchickens.com/threads/post-your-chicken-coop-pictures-here.596294/
You can also go to top of page and click ARTICLES------- COOPS. for more pix.
WISHING YOU BEST...... and
