Great job! I'm going to use my tree climbing skills to install/replace Barred and Screech Owl boxes this summer too.

Where did you get your box design? They look a bit different than the Kestrel boxes we've built and installed. Ours were designed by a biologist from the PA Game Commission.

I'm sure you know this, but I always caution/remind clients that new boxes may not be taken by birds right away. Even if you are replacing an existing box, sometimes it takes 2-3 years for new boxes to become inhabited by the species you are trying to attract. It seems that birds like the older more weathered boxes better. In the mean time, be vigilant - evict squirrels, starlings, and any other species (who try to move in to the boxes) right away.

Best of luck, Kestrels are one of my favorite birds to observe. I once saw one take a ring-neck snake, fly into the air, accidentally drop it, and recapture it before it hit the ground! They're like little jet fighters!