Adding 3 day-old birds to a flock of 6 in April. Next - build the coop addition, which will also share a wall with the existing, initially separated by a hardware cloth barrier and again with a 4” x 7” chick door after the first two week separation period.
The opening shown in one of the photos of the run is the last section of HC that I screwed rather than stapled on, as in the next few weeks or months that will be where I build and attach the new coop extension.