We are building an A frame portible run / roost for our 4 chicks. They will be 8 weeks old when we put them in. The part with the roost will be 4' high and the roost will be about 2 - 2 1/2' from the ground. We are new to chickens so don't know what to expect. Right now in the brooder they perch on a 1" dowel 5" off the floor. Do we start out with a 1" dowel and then progress to a 2" perch? Do we put it lower at first or will they be able to get up to one that is 2 - 2 1/2' high? We don't need to make a ramp up to the perch do we? Also I see a lot of nesting boxes that open from the top aren't these harder to clean out than one that opens in the back? Which is better?