You'll need to tack your bars down, so that they don't create a Hazzard.
Do you have enough ventilation?
Inadequate ventilation caused over heating in hot weather and frost bite in cold weather. It leads to a world of difficulties. I'd urge you to read up on this prior to adding anymore chicks. I think you'll be surprised how much healthier a flock can be, with appropriate ventilation.
Also, a breeder that let's people come on their property, to look at their birds, is asking for trouble. Shoes can carry in disease in from other flocks. I'm not a breeder, but when I sell or rehome birds, I meet the buyer elsewhere. It is a pain, but it keeps my flock safe. I never bring in any chickens, other than newly hatched chicks.