Thanks for all this input you guys! So, for ventilation, that would be areas that are left open 24/7? Would open eaves be enough? All around the top? Or do I need additional vents in the walls?
Yes, ventilation is open 24/7, you can use your nose to determine if it's enough in regards to ammonia, if you smell ammonia it's not enough, if there is no ammonia smell you have enough...
As for determining if it's enough for humidity removal, put a humidity gauge outside and one in the coop, the one in the coop should be only marginally more if at all, if it's say over 5% or 10% more inside the coop then you likley need more ventilation especially in the winter if it's not heated above freezing...