So this is exactly the process I mentioned up in post 4.
Transcribe the melody.
Add some lyrics.
Add any old chords I can find.
This is where we have made it so far, and you are beginning the next steps.
Play. Listen. Evaluate the differences and choose which you like better.
I presume that on Rich's video, his uke is in standard tuning. And since most of his chords match mine, I think that is a safe bet.
I DO see many differences. As you point out, D7 (2020) instead of the Am that I have listed. I will try to run through the piece and listen against both the video and the riffstation piece. And then pick what sounds best.
I will look and listen for the G7sus (0213)? that you mentioned.
I am not sure when Rich is referring to uke chords and when he is referring to guitar chord shapes. I suspect that he is interchanging them, but since I can only fake 2 or 3 chords on a guitar, I can't really say.
Tonight is my Cleveland Jumping Fleas meetup, so I won't make much progress. Let me know if you see other discrepancies.