I finished off the hardanger from the end of January by inserting it into the lid of a box.
I mounted the embroidery by lacing it and a piece of burgundy lining fabric around a thin layer of quilt batting and piece of foamcore (which came with the box).
The lining and hardanger were each laced separately, and the corners folded and sewn flat.
The box is handmade (but not by me!), and I'm very happy with the quality. It has a magnetic catch, is well constructed and finished, and is lined with burgundy velvet. The embroidery is held in place in the lid with a pressure-fit backing board.
I am very pleased with this project.