headboard did get hung up. We've been enjoying it for about a month now. You can see we also hung up some pictures. These are some wedding pictures, and they were hanging on a different wall before. We ended up abandoning the flush mounts to hang the headboard, as the ones we bought were not intended for something this big. Instead, James bought some other brackets with eye holes. He attached two of them to the top board on the back of the headboard. Then he screwed two wood screws into the studs in our wall, and hung the headboard from the wall by hanging the brackets from the screws. I wasn't around for this, so I don't have pictures. I'm not sure what kind of brackets they were or the exact steps of the installation. I'm sure it involved measuring and a level, and if anyone is on the edge of their seat waiting for details I can probably get James to answer questions in the comments.
Laura, who made her own paneled headboard with canvases. I love how the same concept has a totally different look with a different fabric and canvas configuration. I really like the square canvases she used, and how they fit perfectly under her window. I think her headboard turned out great, and it was really fun seeing a project inspired by mine. Thanks so much for sharing, Laura!