So the issue is with the smaller Beleriand? I did end up scaling that up as much as possible, fudging the scale a little in order to have the Blue Mountains line up, since they are the only common marker, but there's not much else to go on there.
I made this messy incomplete base map a few years back (and just drew over it this past weekend), so I can't remember exactly how I determined the scale, but looking at it now, it is possible that the Blue Mountains that we see in the First Age extend all the way down to where we see the White Mountains turning southeastward... hmmm... if that were the case the First Age dwarves would see a larger degree of difference based on North-South climates...
But it does seem like Beleriand isn't that big compared to the Middle-Earth we see in LotR... certainly travel seems to take less time in the Silmarillion, but that could be due to differing perspectives of the narrators.
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As for Rhun and Harad, yeah KWF only has them getting into Russia and the Mediterranean, not different hemispheres, but I'm currently drawing dwarves for those regions with more leeway because of that.
... it's really only the Broadbeams, the Firebeards, and the Longbeards that one needs to worry about, since we know there was mingling between them from the migrations mentioned in the text, and their placements are fairly set in stone.
I was merely entertaining the possibilities a few of the Blacklocks, Stiffbeards, Ironfists, and Stonefoots, making their way back West for whatever reason, to see how it could affect the diversity of a certain Thorin & Company. Really that's the secret reason that this map even exists, not for SilmFilm, but for some stray headcanon idea that passed through my brain... I mean Dori/Nori/Ori and Bifur/Bofur/Bombur are not of the Durin's line like Thorin/Balin/Dwalin/Fili/Kili, but are still distantly related, so I was thinking maybe they were still part Longbeard but mixed with something else (besides Broadbeams and Firebeards)?