That's right you're in Amish country in PA. I wish we had some good local craftsmen around us too. I want one for my new kitchen cabinets too!
I like your math too. Although I need to get rid of more then one to add any. I really need to lower my count to 12 and I am at 22, so I have a ways to go.
If I lower to 12 then I can add 4 to 6 more. We realized we only need 12 layers and have younger ones rotating in each year or every other year as the older ones age, get broody, molt, etc. I may give away a few to some some friends or family starting a flock, but they both may be all talk and never get a coop built. Guess we'll see.
Those little chicks are so cute though, hopefully all my planning doesn't go out the window when I see them.