There are 2 nord clans: The Wolf Clan and the Bear Clan, they are spread over skyrim and enemys for centuries...
I haven't found anything on this at the Imperial Library, so I guess this your own idea. There is nothing wrong with this as the nords seem to be organized in clans. I suppose the Bearclan Nords do wear bear armors and the Wolfclan Nords consequently wear wolf armors.
But anyway, only two clans in all Skyrim?
Even if this had an evidence in lore I would aim at more diversity. Solstheim is much smaller but is inhabited by at least 3 Nord groups: The Thirsk People, the Skaal and the Berserkers (there are also witches and highwaymen).
Are 250 new rocks, 40 new trees ond bushes, falmer ruins, memorial places and more unique enough?
New sorts of flowers and bushes would be especially nice. And new nordic furniture+clothing.
(I hope) you will make the best of it. :goodjob: