Assemble the two tiny chimneys and glue in place at the ends of the roof.
Assemble the eight-sided cupola and glue in place in the center of the roof. Add the tiny cupola roof. Glue the two sides of the weather vane back to back and glue upright to the roof.
Cut out the sides of the seven dormers. Fold and glue these in place to the roof first. Then cut out the dormer roofs, folding each in half with a tweezers, or using the technique referenced above for folding small pieces.