Bbrowsing the internet for future coop ideas i came across this. Dimentions make it big enough for 8 chickens, hardware cloth would be added along with plexiglass windows. BUT Its made of cedar. Cedar chips are bad for chickens but is this the same problem? It's certainly cheaper than a shed.
https://www.overstock.com/Sports-To...edar-Cascade-Playhouse/16798226/product.html?
https://www.overstock.com/Sports-To...edar-Cascade-Playhouse/16798226/product.html?