I think I’m done now. Well, no, I still have to brand them with my insignia. And I might make an Alpine Meadows brand after my father’s Angus brand. So that makes these identical 6, plus the lid-opening / hole entry, plus the proto-house that I converted to a wren house by laying a smaller 1″ hole over the original 1.5″ hole. The bluebirds brood up to 3 times in a season, so if I get these in place soon they might find tenants this summer.
I found some new info on bluebirds, showing that they prefer slot openings and it deters other birds. I also didn’t like the open-top box, for structural reasons as well as access for cleaning. This design is tighter, stronger, and comparatively seamless- it should shrug off Montana winters much more effectively.