I'm taking a very very similar approach -- starting off with a computational model driven by an easy-to-diff data structure that can be serialised to YAML/JSON/

I'm taking a very very similar approach -- starting off with a computational model driven by an easy-to-diff data structure that can be serialised to YAML/JSON/XML and then looking for ways of building a UI on top of that. I'd love to share experiences with you -- NDA permitting, of course.