Bonnie's quilts can be labor intensive, but the finish is so worth it! You're so close now, don't give up! You're missing just one unit, which isn't even a difficult one. You can do it! More than once I've had a piece fall off/behind/under something else; maybe you'll find it.
The fabric issues you had are sure irritating, but at least you found out before they were in a finished top. Good luck, hope you will tackle this when you are feeling more fresh. I'll pull mine back out one of these days. I went against my better instincts and used the suggested colors, much brighter than my normal palette.