Documentation might be great, might be lacking the details, you name it.
That said, when we are in front of our clients and/or need to provide the details, we scramble to assemble something that quite a few competitors have readily available. As the saying goes, a picture is worth a thousand words.
With that in mind - and because finding a diagram with all the level of detail frequently asked for by clients was not really available, I've managed to assemble the attached. Network tier details will be required, as each client's network zoning will be different.
I hope others will find it useful, enrich it, update it & re-share it, etc.
Special thanks to @Mike Berthold and other teammates.