If you add a second coop, or build on to the existing one, you might have room for more birds. However, I don't suggest adding more yet. It'll just be too crowded. Chickens have their 'personal space' too, and over-crowding leads to injuries and unhappy birds. If you add birds, they'll have to have space to escape while the new pecking order gets sorted out.
Also, I agree with Momatomany above - your run isn't as secure as you think with the chicken wire. A determined raccoon or dog/fox/coyote can rip through chicken wire pretty easily. And snakes can easily enter. Hardware cloth is a better option. Meanwhile, you could add a locking door to that coop entry, and lock them inside at night.
No apologies needed for using leftover materials! It's the BEST kind of building for DIY chicken coops. I love it!
Also, I agree with Momatomany above - your run isn't as secure as you think with the chicken wire. A determined raccoon or dog/fox/coyote can rip through chicken wire pretty easily. And snakes can easily enter. Hardware cloth is a better option. Meanwhile, you could add a locking door to that coop entry, and lock them inside at night.
No apologies needed for using leftover materials! It's the BEST kind of building for DIY chicken coops. I love it!