Comment by cturner

Each publishing house and newspaper has a home-grown pipeline to do something close to this.

With work, you can get something that does most of what you want with a few stacks. You can cobble it together for markdown. Alternatively, there are strong plugins to emacs org mode that can go to TeX, then postscript, then PDF. There is probably a stack centred around docbook as well.

My experience has been that if you care about details, you will need to write parts yourself, as you have done. Emacs org mode is a good starting point. You can create your foundation data structures in org-mode trees, and then transform out to the main render pipelines (TeX, etc).