Bluebird Houses; new design

13 houses of similar design; by the last three I had it figured out.
A flip-open lid for quick nest inspection, and a side door for seasonal cleaning. Two cedar fence panels (5.5″ x 6′) makes 3 houses, and with the hardware each house costs about $5. There are cheaper ways, but these get hit by bears and cows and hail and blizzards.
The little brass hooks pin the lids and doors closed. The metal D-rings (a pair near the top, and at center bottom for stability) provide sturdy metal-to-metal contact points for the hanging wire.
Slot openings rather than holes. The process moves right to left for prototypes to show model. The first four originally were side-door only and have turn screw doors that pin into a matching cylinder mounted in the door.
These door-hinge-only houses were the first, and at the end I went back and added roof hinges made of bicycle inner tube (one long $10 hinge cuts into 4 double hinged houses- and I ran out of hinges before I ran out of houses). I also ran short on D-Rings, so went old-school with wide-head screws.

It seems that every two years I have to make a new bluebird house design. I hope these answer all the issues the prior designs haven’t addressed.

Two different designs of the past were my Zero Profile https://dangerhart.wordpress.com/2017/07/13/zero-profile-bluebird-houses/ which are only used by tree swallows, my redwood house designs began here https://dangerhart.wordpress.com/2015/06/ which led to https://dangerhart.wordpress.com/2015/07/12/mountain-bluebird-house-upgrade/ and then a series of 6 slot houses https://dangerhart.wordpress.com/2015/07/16/mountain-bluebird-condos/ that the bluebirds have used successfully.

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