Hi folks, so sorry to disturb again.

1. Thanks so much for helping with bookdown/issues/883, which worked for me and resolved the issue.
2. I posted on SO over a week ago, but seem to be getting very little traffic on my question. So i'd like to push it here, if you do not mind, please. stackoverflow.com/bookdown-proof-custom-environment-how-to-nest-code-chunks-or-inline-r-inside
   From my search, I believe and it looks like a lot of people have been looking for similar things over the years....

As I posted there in the comments, I don't know if a child document or more likely a lua filter approach would work - despite using XieYiHui's awesome code for so many years now, I am still a total newbie unfortunately. Therefore, your expert help is all the more appreciated. My only goal is to produce a book that can compile in pdf, epub, and html, BUT produce slides at the same time... in the original spirit of beamer...

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