Do you have only the charms, or are you supplementing with yardage?
If you look more carefully at this pattern, the sewing could be achieved more easily with two blocks, set on point. One block is just 3 strips sewn together, and the other is a QST. Getting the coloration right might be a challenge, depending on the fabrics you're working with. For a 2-color (not necessarily 2-fabric) quilt it would be easy.