A small box shaped like a house
Generated a box from Boxes Py. Next, I made rectangles for the roof and triangles for the gable ends.
I made score lines to show where to glue the small rectangles for the roof.
Glue the small rectangles to the inside of the roof panels where the scoring is. Next glue the triangles up against the outside of the small rectangles. Glue the longer rectangles to the inside of the side walls of the house. Glue the thin strip to the top of the roof.