I did make the curtains! Out of old feedbags and some thumbtacks I had laying around, they look nice. lol. Thank you all for your advice, I will put the landing on! The opening of the boxes are 12-12.5 inches square. They are still not laying in the boxes (well only 1 is!)
These are my boxes. They are about 18-24" about the floor. The girls dont like them :( I have heavy breeds (buff orpington) and they will be getting curtains this weekend. Should they have a landing bar like the one shown in the drawing below? Thanks!