Me and the Mrs made this for the in-laws for Christmas (just got round to posting).
Main body is scraps of 18mm exterior ply that I had left.
The laser cut details are 4mm ply.
Roof is left over shed felt.
Painted with acrylic and coated to make it weatherproof.
Made with workbee CNC + k40 for the detail. (Software used Aspire and lightburn)
It’s not perfect had to get the file out to make it fit in places, but it should be nice and cosy for some birds to nest.