I love it! A suggestion for much further down the line: a timeline on the map which composites many maps from a similar time period so you can see them all stitched together (somewhat like how https://skyvector.com/ stitches together multiple sectional charts into a continuous map, though I know it can't be as seamless). Or you could attempt to run some extra processing steps to warp the map to match the background map's projection. Those are both big undertakings, though.