If I had read the instructions, and the underlined note next to the pattern, I would have known that Sarah's template included seam allowance. But no, that would have been too easy.
So after fudging and redoing my Dresden plate looks like this
It's fine, it's done and I am happy with it. The heating pad sewing took up all my sewing time this weekend, so I still need to piece 5 blocks! But that will hopefully be less challenging than making a Dresden from the wrong template 😊