Since my coop is raised 2' off the ground and it's a walk-in coop, I'm planning to put a deck off the front with stairs to make it easier for me. But the best way I can think of (for a number of reasons) to get the chickens down from their pop door (which is 12" above the future deck) is to have the ramp go through a hole in the deck. So I'm wondering how big a hole I need to make in the deck to allow them to go down the ramp without hitting their heads on the deck on the way down! I'm wondering if 12" headroom will be enough, or if I need to figure out how to give them more. Any ideas? I have several different breeds (9 chicks altogether), but it looks like the two Brahmas will be the biggest, if their 7-week old size is any indication.