Triangle Nest Box.

The materials required are a 6 inch board, we used a cedar fencing board, for the back and front and the base. Two pieces can also be used for the roof, we used some old plywood. Alternative roof pieces can be used, bark or driftwood can give a pleasing result. A few 2" nails, 4 screws 1 1/2 inches. Tools include an electric saw, a drill and 1 1/4 inch and a 1/8 inch bit, a hammer and screw driver.
The back and front are 10 inches long by the width of the board. Measure the 10 inch length along the bottom and five inches along the top.
Draw lines from the bottom marks to the top one as shown. Cut one piecs out and, using it as a template, cut the second piece.
In one of these pieces, drill a 1 1/4 inch hole, in the centre and 2 inches down.
Cut a piece of the board for the base, 10 inches long. Drill two 1/8 inch holes along each side.
Attach the base to the back and front sections with 1 1/2 inch screws through those holes.
When the base is attached it should be ready for the roof.
As mentioned, bark pieces, wooden shingles or plywood can be used. These roof pieces can be nailed on to the back and the front. A little overhang can be on the front section but the back should be flush.
A small piece of driftwood or whatever is available can be cut the width of the roof. This can be nailed on for the ridge cap.
A piece of bark can be added to the front to add to the appearance and help the birds entering the box.
A small batten, 3" x 1/2", will make a suitable hanger attached to the back, a few inches below and above the nest box, for attaching to a post of a tree.