The project requires basic cutting out of the profiles, tab removal and then glueing up the various components in a russian doll technique, large to small.
Keep the bird house in 2 halfs and screw together to allow for out of season cleaning of the birdnest
I recommend coating your plywood in a polyurethane lacquer inside and out to protect the birds from toxins in the wood and to keep the wood in a weatherproof state. You'll need a small 8mm dowel for the pirch.
500 x 1220 x 18mm plywood, material surface
60 mins cut time
60 mins assembly and some drying time.