Your reuse of something old for something new is great. Wish I had the time and energy to do the same. But my 12hours days right now don't give me enough time. :)
Hello and welcome to the flock of chicken crazy people. Pull up a chair and ask away. There are so many helpful people here with all kinds of knowledge. :D
Sorry you have so many cockerels but you do have wonderful chicken meat for: chicken n dumplins, chicken n rice, chicken soup, chicken ala king ect ect ect….
Very well could be a racoon as lilfox said. I use 3 different types of closer on my coop. 2 intertwined bungies, spring hook latch and cross board at the door. I suggest put a animal trap cage out with a can of cat food in the back and see what you catch. Racoons are mean and smart. If you have...
The run roughly 10x6. Will give you 60 square feet. A run of 10x5 will give you 50. You need at least 30square. Best to have a little too much than not enough.
And welcome to flock of crazy chicken people!