Yes! I tossed up on that idea, but since I already added the black border to the image, I thought that might be an interesting look (but maybe not?). Check the video again.
Quite similar, but the SPR filter with key frames definitely gives more precise control compared to the way I did it (that’s once again possibly because my way isn’t the best). Although I do have an idea on another way to do the black borders.
I’m happy to report there’s nothing fancy in what I’ve done (hopefully that’s not too disappointing 
) I learned how to do the key framing from watching @MusicalBox’s demo on how to animate a line with a rectangle shape (using trim clip) from this thread:
If you watch that video and then look at the .rawr in Glaxnimate, most of it should make sense. If there’s enough interest I can do one. But first, I have to figure out how to do something more interesting in Glaxnimate to add to the end of the video, otherwise it is just boxes and lines!