Panda3D WebGL Port!

I really want to give it a try, but little luck so far.
I got pointed some time ago to: github.com/pmp-p/panda3d-webgl-runtime but I don’t think it’s working as intended on my PC

So I expect I need to compile this branch:
github.com/panda3d/panda3d/tree/webgl-port
using these third party libs:
rdb.name/panda3d-webgl-build-depends.tar.gz
and I also need emscripten from here:
kripken.github.io/emscripten-site/index.html
and then run freezify.py from:
rdb.name/webgl-music-box.zip
…after fixing all the paths?

A how-to-for dummies would really be welcome.