6. For the curved roof, gently bend the license plateinto an arc, then attach it with a nail or screw (pre-drilled again) at the top of the house's curve. Add 2 more nails at intervals down the sloping sides, along both the front and back edge, for a total of 10 nails. For the peaked roof, bend the license over the edge of a table to make a crisp crease. To finish the roof, crimp the edges of the license plate to make a jaunty edge. If needed, drill small holes in the bottom and the sides of the birdhouse for drainage and ventilation.