Stitching the ridge tiles to finish the ornament
Take one ridge tile and wrap it over the ridge of the roof as shown below. Using two strands of black thread stitch through all layers from front to back catching the edges of the ridge tiles to secure it. It's hard to show this because it's black thread on black felt but it should make sense as you do it. When you get to the twine, you'll need to cut a slit in one of the ridge tiles and slip it around the twine. Stitch the cut slit closed around the twine and continue adding tiles till you're done. All the steps are shown in the photos and videos below.
Congratulations, you are done! I really hope you enjoy the process.