Hi Godfrey, I must say again how impressed I am with what you are doing, certainly you have experience in these things and must be a coder.
You asked for input so I am putting in my 2 cents.
I think the actual photgraphs are perhaps a little too small and get somewhat lost in the scenery. Maybe rendering the project, then expanding it in the timeline would be a good workaround.
My other "criticism" is that when you put the game characters in the mix, you make it very narrow in usability. If you made a version without those then someone could use this for their safari trip.
That being said, I can't wait for your next theme, idea. My 3D slideshow frames look like child's scribbles compared to what you are doing, so happy you found us here!
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