I made a rookie foundation-piecing mistake and over-trimmed one of the seams. Thanks for all your advice on stabilizing the scant seam. I ended up fusing a narrow interfacing strip over the area. I'm confident that the interfacing, reinforced with quilting, will hold the seam together.
You can download the templates here.
If you make something with the templates, I'd love for you to post photos to the Piece and Press Flickr group.