I saw your work posted on Reddit, and was prompted to comment.
First of all: Wow, really terrific work. I really appreciate all the time and effort you put into this. Breaking down land mass, population density, diversity, etc is all incredibly interesting and useful to us novice WorldBuilders in the r/worldbuilding sub :)
My only criticism/ask would be to subdivide Planetos even further- rather than just Westoros / Essos, break Westoros down into The North, and everything south of the Neck. The population density / ethnic make up would be more accurate, considering how different the population scope is North vs South… remember, Young Wolf Robb was only able to field an Army of 18,000 spears after he called his banners, vs the hundred thousand the Baratheon/Tyrell army brought together.
With how inhospitable the North is, even in summer, and the lack of any sizeable population center outside Winterfell / White Harbor, i feel like it’s unfair to lump it in with the other 6 Kingdoms.
Just a couple of thoughts, and thanks again for sharing.