Cool. I ran into lots of gotchas when I was doing it. Granted there is a much better written spec now. If you hit any snags, feel free to hit me up (email is on github profile which is on HN profile).
Sorry, I don't do Twitter or FB, though if you want to keep it public, feel free to start a gitter or just open a github issue/discussion and @-mention me.
I can see on your GitHub page that you made the famous WebAssembly to JVM, nice job!