I want to make a feeder for one of the coops that'll hold 50-100lbs of feed. My question is: If I plan on mounting it "in" the wall, what should I do as far as them growing? They are 8-10 weeks now but when they're full grown they'll need the feeder higher... Should I make it for a full grown chicken and just make a ledge for them to stand on? I don't want to make it and then have to cut another hole in the side of the coop. I don't know if I asked this the right way, I'm hoping someone gets what I'm asking.