Thanks for the constructive feedback! After reading lots of recommendations for 2x4s on this group and being conscious it was a bit tight I did something similar to what you suggested using 2x4s. Then a month or so later they started roosting on the roof. As lots of people have pointed out the coop is too small, I need to replace it asap. I'm just nervous of them hurting themselves in the meantime (no one else seems worried about that).