This box is also suitable as is for screech owls, and could be scaled appropriately for a variety of other species (wood duck, bluebird, swallows, etc.).
Step 1: Box Plans
This Instructable follows the order of steps that I used to construct my boxes, but you are free to mix things up in any way you choose. What seems like a logical and efficient workflow to me might not suit you well, and there are many ways to end up with a functioning nest box.