I've tried this before, and you're right about it not being easy to follow, at least compared to previous incarnations. The above documentation is for a much older version, and the latest I found is here:

https://mozilla.github.io/ecosystem-platform/tutorials/devel...

There's a lot of components directly hooked into Google Cloud that also make it difficult in terms of configuration. At some point I think creating an actual user's guide for this would be good for the community interested in self-hosting this on their own.