I think it's great! I just saw the movie and wanted to find a Jeff figurine, so I searched and came across your video! I'd love to make one too, but I'm going to need some equipment, like the 3D printers I haven't bought yet. You have a new subscriber :) .
You should look up about an machine learning tool that captures voice character. Don't remember how it's called, but it can capture the voice with a few audio samples and then recreate the voice tone. Then you can use that to make it say whatever you want