Hi @geab ,
It looks like that GitHub repository doesn’t have any substantial code. In the presentation he mentioned it uses a special version of MakeCode (around https://youtu.be/LzkN4j2DB_w?t=2032). The video is too blurry to see the URL.
I think the substantial part of Joshua’s work may be in another repo: https://github.com/JoshuaAHill/Dissertation-Project-Files, but that’s not a MakeCode extension.
It may be best to contact Joshua. Perhaps you can “Raise an Issue” on GitHub: https://github.com/JoshuaAHill/dissertation-ui-example/issues .
Bill