Looks like a pretty good emulation so far. I feel it would be even more interesting, however, if it were using actual native elements instead of recreating look-and-feel through CSS.

With the separation of react and react-dom, this is more of a possibility than in the past. I know it would be a Herculean effort, but it would certainly be an incredibly interesting option for me and I'm sure many others! Still, definitely starring this repo.