I currently have chickens that I want to make a feeder like this for, but will be getting turkey poults in June. I am wanting to make a feeder like this for the turkeys: I've seen it recommended to use 4" elbows instead of the normally used 3" if roosters will be feeding, and smaller elbows for chicks. I was wondering if the 4" would be big enough for my Narrangasett turkeys when they are grown? I've never had a turkey, so I have no concrete idea of their behavior or size. I'm also getting ducklings and guineas...Would this idea work for them as well? Would the 4" elbow be enough for them?