Are you still working on this? Because I like the words I see on your GitHub -- vim-style bindings, keyboard driven, sounds like you write a definition language for your designs, basically?
Lik Matry is to Figma as openscad is to traditional CAD (Fusion 360, etc)?
Though that does sound like a huge project to take on!
They solved all this stuff, I'm surprised more people aren't aware of it.