Regarding your post about the Numenor's population. I hope you don't mind, but I think your high-end estimates are kinda implausible. Yes, Numenor would be capable of supporting some (or over) 100 million people but with today's level of technology and globalization. Tolkien toyed with the idea of "steampunk" Numenor embracing the industrial revolution level but went with the more traditional "high fantasy" of development, just more advanced than the Gondor’s one.
I had written a revised version of that post, which I have just reblogged, that you may not have seen. Really, anybody’s figures are a guess, and you’re welcome to prefer whichever ones you like.
Tolkien didn’t write much about Numenor at all, and was quite fond of revising what he did write. Since there was no published version (that Christopher Tolkien did not put together from his father’s notes), we can’t definitively say we have a canon, except what was included in the LOTR appendices.
Personally, a more technologically advanced Numenor with a high population makes the most sense to me. It doesn’t even have to be pushed as far as steampunk; I prefer a Numenor just on the cusp of industrialization myself. Tolkien never accounted for technological advancement in his timelines. Numenor stood uninvaded for over 3,000 years. 3,000 years ago, our world was just seeing Stonehenge built, and Egypt’s first dynasty had existed for about 100 years. Think of all humanity has done in 3,000 years!
It’s really much stranger that the Numenoreans didn’t invent guns and tanks after all that time. They had plenty of peace and resources to devote to technological advancement, and low levels of disease and childhood mortality for much of their early history. Either way, Numenor created great feats of engineering and marvels their descendants couldn’t dream of. They conquered the whole world and built an empire out of it, and even dared make war on the land of the gods. The Numenoreans do plenty of legendary things that have never happened in our world. I don’t think a high population density is too much of a stretch.