My pullets are 20 weeks old and I procrastinated long enough making their nest boxes. I started to put a 1 x 4 lip on them then remembered reading from one of you that you left a gap at the bottom for scraping out the nest box. So instead I did a 1 x 3 lip & raised it up 3/4". What a super idea! I haven't put up a perch because the girls can see inside the boxes from standing. The boxes are only 12" off the floor. I wanted the kids to be able to collect the eggs without going into the coop. Because of our high winds I had to make the access protected. Now we wait!